Answer:
11.442E23molecules
Explanation:
Given data:
Number of moles of water = 1.9 mol
Number of molecules of water = ?
Solution:
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.
The number 6.022 × 10²³ is called Avogadro number.
For example,
18 g of water = 1 mole = 6.022 × 10²³ molecules of water
In 1.9 moles:
1.9 mol × 6.022 × 10²³ molecules / 1 mol
11.442 × 10²³ molecules
In e notation:
11.442E23 molecules
What I need to know to answer this question? and what the answer
Answer: A
Explanation:
The price increased over time, because the numbers underneath the Y Axis Points increase as times goes on.
how many ML are equal to 4.567 x 10^4mL?
Answer:
4.567x10^-5ML
The ML [tex]4.567[/tex] × [tex]10^4mL[/tex] equals the [tex]4.567[/tex] × [tex]10^-5 ML[/tex]
Given that,
[tex]4.567[/tex] × [tex]10^4mL[/tex]
To find,
Number of [tex]ML[/tex] in [tex]4.567[/tex] × [tex]10^4mL[/tex] = ?
Procedure:
As we know,
[tex]mL[/tex] is characterized as a fraction unit of volume
[tex]ML[/tex] is volume's manifold unit.
[tex]mL = 10^-3 L[/tex]
[tex]ML = 10^6 L[/tex]
Therefore,
[tex]1 L = 1000 mL[/tex] & [tex]1 ML = 1000000L[/tex]
Using this formula,
[tex]4.567[/tex] × [tex]10^4mL[/tex] into [tex]ML[/tex]
= [tex]4.567[/tex] × [tex]10^4mL[/tex] × [tex]1L/1000mL[/tex] × [tex]1ML/1000000L[/tex]
= [tex]4.567[/tex] × [tex]10^-5 ML[/tex]
Thus, [tex]4.567[/tex] × [tex]10^4mL[/tex] equals the [tex]4.567[/tex] × [tex]10^-5 ML[/tex].
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How does heat travel from the sun to a plant in a greenhouse?
Answer: Radiation
Explanation: The sun transfers heat energy through radiation since in a vacuum it does not require any medium to allow heat flow.
A substance is matter that has a definite composition.
TRUE or FALSE?
Answer:
FALSE!!
Explanation: some substances like gas or liquid do not have a definite composition/shape
The statement is true. A substance is matter that has a definite composition.
The statement 'A substance is matter that has a definite composition' is TRUE.
In Chemistry, a substance is defined as matter that has a specific and definite composition. This means that a substance is made up of specific types and amounts of atoms or molecules. Examples of substances include water (H2O), salt (NaCl), and oxygen (O2).
Understanding the concept of substances is important in Chemistry because it helps us classify and identify different types of matter based on their composition.
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Salts are the result of
two bases combined
two acids combined
an acid and a base
two elements with a pH lower than 7
If an object is not moving its kinetic energy is zero.
True
False
Answer: This is true because kinetic energy depends on speed. If there's no speed, then there is no kinetic energy.
when the pH of a solution changes from a ph of 5 to a ph of 3, the hydronium ion concentration is
Answer:the hydronium ion changes from 1x10^-5 to 1x10^-3M
Explanation:Please see attachment for explanation
The steepness of a line is measured by finding its what?
The steepness of a line is measured by finding its absolute value of slope.
What is absolute value?Absolute value is defined as to ignore any minus sign before an integer and consider all numbers positive (or zero). One way to think about a number's absolute value is as its distance from zero. The difference between two numerical numbers, whether positive or negative. Therefore, the absolute difference doesn't reveal anything about relative magnitude.
The steepness, incline, or grade of a line can be measured using the slope's absolute value. A slope with a larger absolute value denotes a steeper line. There are four possible directions for a line: up, down, horizontal, or vertical. If a line is horizontal, it has no slope.
Thus, the steepness of a line is measured by finding its absolute value of slope.
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What is an open-loop system?
A.
A group of related objects that do not send out or receive feedback and cannot modify themselves
B.
Any device used to extend human capability
C.
A group of related objects that make up a larger system
D.
A group of related objects that send out and receive feedback and can modify themselves
Answer:
An open-loop system is described as:
Explanation:
A. A group of related objects that do not send out or receive feedback and cannot modify themselves
In an open-loop system:
- The system does not receive feedback on its output to make adjustments.
- The system's operation is predefined and does not depend on external input.
- There is no mechanism in place to modify the system based on the output.
An example of an open-loop system is a traditional thermostat that operates based on pre-set temperature settings without actively sensing the actual room temperature and adjusting accordingly. hope this helps!!
Why is a study of basic chemistry essential to
understanding human physiology?
Answer:
Because it describes the chemica
reactions that underlie all body.
Explanation:
Like movement, digestion, the pumping of your heart and even thoughts.
A basic knowledge of chemistry is crucial to understanding human physiology because processes like digestion, respiration, and all bodily functions involve chemical reactions. Concepts of chemistry like atomic structure, elements, molecules and bonds are fundamental in understanding how different nutrients and toxins impact our health and bodily functions. Thus, chemistry is instrumental in understanding human physiology.
Explanation:Basic chemistry is pivotal in understanding human physiology because it forms the framework for examining the workings of the physical body. For example, chemical reactions occur when we digest food, breathe, or perform any bodily function. These reactions are dependent on the principles of chemistry. Understanding concepts such as atomic structures, elements, molecules, and bonds are fundamentals of chemistry that help us grasp how differing nutrients and toxins affect the body's performance and health. Additionally, the physiology of cell and its function, nerve transmission, muscle contraction, and homeostasis, they all have biochemical basis. Therefore, studying basic chemistry is an essential stepping stone to grasp the understanding of human physiology.
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Edward works for a company that makes paint. Which field of science would
be most closely related to Edward's work?
O
O
O
A. Space science
B. Life science
C. Marine science
D. Physical science
SUBMIT
Answer:
D
Explanation:
A would be. space ship
Answer:
D.Physical science
Explanation:
Which learning theory is based on associative learning?
Which of the following examples is a sign
that a chemical change is occurring?
A. the substance seems to have disappeared
B. the state of the matter has changed
C. the production of heat, light, and smoke
Answer: C. The production of heat, light and smoke
Explanation: In a chemical reaction taking place several evidence are the presence of light emission and heat is generated in the reaction. Smoke is also an indication when a chemical reaction is happening such as combustion reaction.
A decomposition occurs when you open a can or bottle of soda. Carbonic acid. H.CO, is in carbonated beverages. It
decomposes into carbon dioxide and water. If you leave an open soda can out for a long time, it loses its fizz Which equation
represents the chemical equation for this reaction?
H20-602 - H2CO:
H2003 - H20 - CO2
H₂CO₃ + H₂O - CO₂
2H2CO3 - 2H20 - 2002
Answer:
H₂CO₃→H₂O + CO₂
Exphlanation:
Soda is carbonated water. It contains carbon dioxide dissolved in water , which is carbonic acid. On opening the soda, the carbonic acid undergoes the reverse reaction and releases carbon dioxide in the air . The soda is thus left with just water and loses it's fizz.
Answer:
H₂CO₃→H₂O + CO₂
worked it out
Beryllium magnesium and calcium all are located in the alkaline earth group which of these characteristics do these elements have in common?
Answer:
They all have similar compounds when combine with oxygen.
Explanation:
Alkaline earth metals are present in group 2 of periodic table. There are six elements in second group. Beryllium, magnesium, calcium, strontium, barium and radium.
All have two valance electrons but in different energy levels.
Electronic configuration of Beryllium:
Be = [He] 2s²
Electronic configuration of magnesium.
Mg = [Ne] 3s²
Electronic configuration of calcium.
Ca = [Ar] 4s²
They are present in group two and have same number of valance electrons (two valance electrons) and show oxidation state +2 by loosing two valance electrons. They also show similar reactivity.
They react with oxygen and form oxide.
2Be + O₂ → 2BeO
2Mg + O₂ → 2MgO
2Ca + O₂ → 2CaO
this oxide form hydroxide when react with water,
BeO + H₂O → Be(OH)₂
MgO + H₂O → Mg(OH)₂
CaO + H₂O → Ca(OH)₂
With sulfur,
Mg + S → MgS
Ca + S → CaS
Ba + S → BaS
Which of the statements accurately describes compounds?
They contain two visibly distinct parts.
They can be broken down by chemical means.
They cannot contain more than two different components.
They are pure substances.
They have different properties than the components that make them.
Answer:
True statements are 2, 4, 5
Explanation:
They can be broken down by chemical means because we need to break chemical bonds between two (or more) atoms.
They are pure substance because one can't separate them by physical means.
When one separate compounds on two (or more) substances, there are two (or more) different species and they all act differently.
Final answer:
A compound is a pure substance that consists of two or more elements in a fixed proportion, with properties distinct from the elements that compose it. Examples include water and table salt. Compounds can be chemically separated into simpler substances, unlike mixtures, where components retain their original properties.
Explanation:
When discussing compounds, there are key characteristics that define them. Compounds are pure substances with unique and consistent compositions that can be broken down by chemical means. Unlike a mixture, where the substances involved retain their individual properties, a compound has distinct properties that are different from those of the elements that make it up. For instance, when sodium (a soft, shiny metal) combines with chlorine (a pungent green gas), they form sodium chloride (table salt), which is a white, crystalline solid vastly different from either element.
A compound contains two or more elements chemically combined in a fixed proportion. An example of a compound is water (H₂O), consisting of two hydrogen atoms and one oxygen atom bonded together. A compound is not a mixture because it has a fixed composition throughout, and the attributes of its components blend to create entirely new properties.
strontium combines with bromine to form strontium bromide.What happens to the electrons in the outer levels when strontium atoms and bromine atoms combine to make strontium bromide??
Plz help me...50 points
Answer:
Im bad at these questions but i think the answer is SrBr2
Explanation:
A sample of gas at 47°C and 1.03 atm occupies a volume of 2.20 mL. What would this gas occupy at 107°C and 0.789 atm
Answer: 3.41 mL
Explanation: Solution:
Use Combine gas law to solve this problem.
P1V1 / T1 = P2V2 / T2
First convert temperature to K
T1 = 47 °C + 273 = 320 K
T2= 107°C + 273 = 380 K
Derive to find V2:
V2 = P1 V1 T2 / T1 P2
Substitute the values:
V2= 1.03 atm x 2.20 mL x 380 K /
320 K x 0.789 atm
= 3.41 mL
Cancel out the units of atm and K so the remaining unit is in mL.
Using the combined gas law equation, we can find the new volume of a gas given its initial volume, temperature, and pressure.
Explanation:To solve this problem, we can use the combined gas law equation: PV/T = constant. Since the volume, pressure, and temperature of the gas change, we can set up the equation as follows: (1.03 atm)(2.20 mL)/(47°C) = (0.789 atm)(V2)/(107°C). We can then solve for V2 to find the new volume of the gas.
Using this equation, we can rearrange it to:
V2 = (1.03 atm)(2.20 mL)(107°C)/(0.789 atm)(47°C)
Calculating the values, we find that V2 is approximately 4.61 mL.
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Calculate the amount of heat energy, in units of kilojoules, required to convert 50.0 g of liquid ethanol, CH3CH2OH, at 25.5°C to gaseous ethanol at 92.0°C. (Cethanol liquid = 2.44 J/g°C; Cethanol gas = 1.42 J/g°C; molar heat of vaporization of liquid ethanol = 3.86 × 104 J/mol. The boiling point of ethanol is 78.4°C.)
Answer:
42.1 kj
Explanation:
Given data:
Molar heat of vaporization = 3.86×10⁴ j/mol
Mass of ethanol = 50 g
Amount of heat required to convert into gaseous form = ?
Solution:
First of all we will calculate the number of moles of ethanol.
Number of moles = mass/ molar mass
Number of moles = 50.0 g/ 46.07 g/mol
Number of moles = 1.09 mol
H(vap) = number of moles × molar heat of vaporization
H(vap) = 1.09 mol × 3.86×10⁴ j/mol
H(vap) = 4.21×10⁴ j
In Kj:
4.21×10⁴ / 1000 = 42.1 kj
calculate answers to the following problems to the correct number of significant figures.
30.07g/0.106mL=
Answer:
d = 283.68 g/mL
Explanation:
Here the unit given are gram/ milliliter. The given data shows that its density, because,
density = mass/ volume
d = m/v
d = 30.07 g/ 0.106 mL
d = 283.68 g/mL
Density:
Density is equal to the mass of substance divided by its volume.
Units:
SI unit of density is Kg/m3.
Other units are given below,
g/cm3, g/mL , kg/L
Formula:
D=m/v
D= density
m=mass
V=volume
Symbol:
The symbol used for density is called rho. It is represented by ρ. However letter D can also be used to represen t the density.
1. what type of ion is chlorine ?
2. what type of ion is oxygen?
3. what type of ion is
magnesium?
4. what type of ion is silicone?
5. what type of ion is carbonate?
6. what type of ion is nitrate?
Answer:
1. Univalent negative ion (Cl-)
2. Divalent negative ion (O2-)
3. Divalent positive ion (Mg2+)
4. Divalent negative ion (S2-)
5. Divalent negative ion (CO3)^2-
6. Univalent negative ion (NO3) ^-
You have a sample of 0.25 mol of unknown gas at STP. Can you predict the volume of the gas, even if you don’t know the identity of the gas ? Can you predict the mass of the sample ? Explain.
Answer:
a. 5.6 L
b. can be find without given mass or Molar mass
Explanation:
Data given:
mole of unknown gas = 0.25 mol
volume of gas = ?
mass of the sample = ?
Solution:
Yes we can find volume of the gas by using its amount of moles.
To find the volume of the gas at STP the following formula can be used
no. of moles = volume of gas / molar volume
Rearrange the above formula
volume of gas = no. of moles x molar volume . . . . . (1)
Where
molar mass of gas = 22.4 L/mol
Put values in equation 1
volume of gas = 0.25 mol x 22.4 (L/mol)
volume of gas = 5.6 L
So the volume of gas is 5.6 L.
_____
Q. Can you predict the mass of the sample?
To find mass of the gas we must know the molar mass of gas.
if we Know the molar mass of gas the by using ideal gas equation we can find mass of unknown gas
ideal gas equation
PV = nRT . . . . . . .(1)
where
n = m/M . . . . . . (2)
by combining equation 1 and 2 we get following equation
PV = m/MRT . . . . . . .(3)
Now by rearranging equation 3 we can find mass of gas or Molar mass of gas. but one value must be given.
6.1 Raunak took 5 moles of carbon atoms in a containe má Krish also took 5
moles of sodium atoms in another container of the same weight
(a) Whose container is heavier?
(b) Whose container has more number of atoms?
a. Krish's container is heavier than Raunak's container.
b. Both container have the same number of atoms.
Explanation:
The molar mass of any element is equivalent to one mole of that substance.
weight of 1 mole of carbon atom is 12 g and weight of 1 mole of sodium atoms is 23 g.
So, the mass of 5 moles of carbon atoms
12 x 5 = 60 g
In this same way,
the mass of 5 moles of sodium atoms
23 x 5 = 115g
From this, we can say that Krishna’s container is heavier.
b. One mole of a carbon atom has 6.022 x 10^23 atoms and one mole of sodium also has 6.022 x 10^23 atoms.
So, 5 moles of carbon and sodium contains the same number atoms which are
5 x 6.022 x 10^23
= 3.011 x 10^24 atoms.
How many formula units are in 3.6 grams of NaCl?
Answer: 3.914 x 10^22 formula units
Explanation:
number of moles of NaCl = 3.8g/58.5g/mol = 0.065 moles
Formula units of NaCl = 0.065 x 6.022 x 10^23 = 3.914 x 10^22
Formula units are defined as the empirical formula of an ionic or covalent compound used to express them as independent entities.
Given that:
Given mass = 3.6 gram
Formula units =?
Molecular mass of NaCl = 58.44 g/mol
As we know:
[tex]\rm moles &= \dfrac{\text{given mass}}{molecular\; mass}[/tex]
[tex]\rm moles = \dfrac{3.6}{58.44}\\\\\rm moles = 0.061\\[/tex]
Now,
1 mole = [tex]6.022 \times 10^{23}[/tex]
[tex]\begin{aligned} \rm 0.061\; moles &= 0.061 \times 6.022 \times 10^{23}\\\\\rm moles &=3.67 \times 10^{22}\end[/tex]
Thus, the formula units in the 3.6 grams of NaCl is [tex]3.67 \times 10^{22}[/tex].
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how many Fahrenheit degrees seperate the freezing and boiling points of water? what are these two temperatures?
Explanation:
Boiling temperature is 212° F, while freezing is 32 °F, so it would be a difference of 181 degrees.
Hope you have a good day!
In the Fahrenheit scale, water freezes at 32 degrees and boils at 212 degrees. Hence, there are 180 degrees Fahrenheit separating the freezing and boiling points of water.
Explanation:In the Fahrenheit temperature scale, the freezing point of water is 32 degrees Fahrenheit and the boiling point of water is 212 degrees Fahrenheit. To find out how many Fahrenheit degrees separate these two points, we need to subtract the freezing point from the boiling point.
212 (boiling point) - 32 (freezing point) = 180
Therefore, there are 180 degrees Fahrenheit between the freezing and boiling points of water.
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For atoms in the ground state, electrons begin filling the 3d sublevels starting with 1. Sr and ending with Cd 2. Sc and ending with Cd 3. Sr and ending with Cu 4. Sc and ending with Cu
Final answer:
In the ground state of atoms, the filling of 3d sublevels begins with scandium (Sc) and ends with copper (Cu), making the correct answer 4. SC and ending with Cu.
Explanation:
The question asks about the process of electron filling in the 3d sublevels within transition metals. In the ground state of atoms, this process begins with scandium (Sc) and ends with copper (Cu). So the correct answer to the student's question is 4. Sc and ending with Cu. Scandium, with atomic number 21, is where the 3d subshell begins to fill, and it continues to fill until the 3d subshell is complete with copper (Cu). Following this, electrons will then fill the 4p subshell.
The provided materials clarify that the 3d subshell is capable of holding up to 10 electrons, which correlates with there being 5 distinct d orbitals. Moreover, the principles of electron configuration suggest that half-filled and fully filled subshells, such as those observed in chromium (Cr) and copper (Cu), have enhanced stability due to electron distribution.
The unusual filling order of electron subshells, particularly after the 3p subshell is complete, leads to the 4s sublevel filling before the 3d sublevel. This is why the 3d sublevel does not start filling immediately after Argon (Ar), but rather after the 4s is filled, beginning with scandium (Sc).
Which compound has the greatest percentage by mass of nitrogen atoms?
a) N2H4
b) NH3
c) N2O4
d) NaNO3
please explain your answer
The compound with the greatest percentage by mass of nitrogen atoms is (d) NaNO3.
Which compound is with the greatest percentage?To determine the compound with the highest percentage by mass of nitrogen atoms, we need to calculate the molar mass and nitrogen content of each compound.
N2H4 (Hydrazine): It has a molar mass of 32 g/mol and contains 2 nitrogen atoms. Therefore, the percentage of nitrogen by mass is (2 × 14 g/mol / 32 g/mol) × 100% = 87.5%.
NH3 (Ammonia): It has a molar mass of 17 g/mol and contains 1 nitrogen atom. So, the percentage of nitrogen by mass is (1 × 14 g/mol / 17 g/mol) × 100% = 82.4%.
N2O4 (Dinitrogen tetroxide): It has a molar mass of 92 g/mol and contains 2 nitrogen atoms. The percentage of nitrogen by mass is (2 × 14 g/mol / 92 g/mol) × 100% = 30.4%.
NaNO3 (Sodium nitrate): It has a molar mass of 85 g/mol and contains 1 nitrogen atom. The percentage of nitrogen by mass is (1 × 14 g/mol / 85 g/mol) × 100% = 16.5%.
Among the given compounds, NaNO3 has the lowest percentage of nitrogen by mass, making it the compound with the greatest percentage by mass of nitrogen atoms.
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The correct answer is option a). The compound with the greatest percentage by mass of nitrogen atoms is [tex]\( {\text{N2H4}} \)[/tex] (hydrazine), with approximately 87.5% nitrogen by mass.
Let's calculate the percentage by mass of nitrogen for each compound:
Molecular Formulas:
a) N2H4 (hydrazine)
b) NH3 (ammonia)
c) N2O4 (dinitrogen tetroxide)
d) NaNO3 (sodium nitrate)
Calculation Steps:
1. Calculate the molar mass of each compound:
N2H4 (hydrazine):Molar mass = 2(N) + 4(H) = 2(14.01) + 4(1.01) = 32.05 g/mol
NH3 (ammonia):Molar mass = 1(N) + 3(H) = 1(14.01) + 3(1.01) = 17.03 g/mol
N2O4 (dinitrogen tetroxide):Molar mass = 2(N) + 4(O) = 2(14.01) + 4(16.00) = 92.02 g/mol
NaNO3 (sodium nitrate):Molar mass = 1(Na) + 1(N) + 3(O) = 1(22.99) + 1(14.01) + 3(16.00) = 84.99 g/mol
2. Calculate the percentage by mass of nitrogen in each compound:
For N2H4:[tex]\[ \text{Percentage by mass of N} = \frac{2 \times 14.01}{32.05} \times 100\% = \frac{28.02}{32.05} \times 100\% \approx 87.5\% \][/tex]
For NH3:[tex]\[ \text{Percentage by mass of N} = \frac{14.01}{17.03} \times 100\% \approx 82.3\% \][/tex]
For N2O4:[tex]\[ \text{Percentage by mass of N} = \frac{2 \times 14.01}{92.02} \times 100\% \approx 30.5\% \][/tex]
For NaNO3:
[tex]\[ \text{Percentage by mass of N} = \frac{14.01}{84.99} \times 100\% \approx 16.5\% \][/tex]
How many atoms of ^6Li are there in 12.3 g of ^6Li?
The number of ⁶Li atoms present is 1.23 × 10²⁴ atoms
StoichiometryFrom the question, we are to determine the number of ⁶Li atoms present.
First, we will determine the number of moles of ⁶Li present.
Using the formula,
[tex]Number\ of\ moles = \frac{Mass}{Molar\ mass}[/tex]
Mass of ⁶Li = 12.3 g
Molar mass of ⁶Li = 6 g/mole
Number of moles of ⁶Li present = [tex]\frac{12.3}{6}[/tex]
Number of moles of ⁶Li present = 2.05 moles
Now, for the number of atoms
Using the formula,
Number of atoms = Number of moles × Avogadro's constant
Then
Number of atoms of ⁶Li = 2.05 × 6.022×10²³
Number of atoms of ⁶Li = 1.23451 × 10²⁴ atoms
Number of atoms of ⁶Li ≅ 1.23 × 10²⁴ atoms
Hence, the number of ⁶Li atoms present is 1.23 × 10²⁴ atoms
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What is a semiconductor?
A. A conductor that operates only at low temperatures.
B. A conductor that conducts electricity faster than common metals.
C. A conductor that has less conductivity than do metallic
conductors
D. A substance that completely blocks the flow of electricity.
Answer:
C. A conductor that has less conductivity than do metallic
conductors
Explanation:
Semi means less
Answer:
C. A conductor that has less conductivity than metallic conductors
Explanation:
A semiconductor can conduct electricity, so they're not insulators, but the conductivity isn't as effective as a metal.
What is a mole? List everything you know about the mole.
How many atoms are present in 3.8 moles of sodium hydroxide, NaOH?
Calculate the molar mass for Ca(OH)2.
Answer:
1. A mole is the amount which contains as many elementary particles as there are atoms in 12 grams of carbon-12. It is also the unit used in measuring the amount of matter. A mole also refers to the Avogadro's number of particles present in any substance.
2. 1mole of NaOH contains 6.02x10^23 atoms.
Therefore, 3.8 moles of NaOH will contain = 3.8 x 6.02x10^23 = 2.288 x 10^24 atoms
3. Molar Mass of Ca(OH)2 = 40 + 2(16+1) = 40 2(17) = 40 + 34 = 74g/mol
Explanation: