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schepotkina [342]
3 years ago
10

Which of the following compounds has the largest formula mass? H20 NH3 со BeH2

Chemistry
1 answer:
WINSTONCH [101]3 years ago
3 0

CO has the largest formula mass.

<h3><u>Explanation:</u></h3>

The formula mass of carbon monoxide, CO.

The relative atomic mass of carbon is 12 and of oxygen is 16, so the relative formula mass is:   12 + 16 = 28

The formula mass of H_2O:

\frac{(2\ H\ atoms) 1.01\ amu}{ 1\ H\ atom} = 2.02 amu  (1 O atoms)

(1 O atoms) 16.00 amu / 1 O atom = 16.00 amu  

2.02 amu + 16.00 amu =18.02 amu

The formula mass of Ammonia, NH_3 is [14.0 g/mol + 3.0 g/mol] = 17.0 g/mol.

The formula  mass of BeH_2 = 11.028062 g/mol

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<h3><u>How to find the number of moles?</u></h3>

A mole is the mass of a material made up of the same number of fundamental components. Atoms in a 12 gram example are identical to 12C. Depending on the material, the fundamental units may be molecules, atoms, or formula units.

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