Question

The chemical formula of glycine (a building block of proteins) is c2h5no2. the formula mass of glycine is 75.08 amu. what is the mass percent composition of c in glycine?

Answer 1

The mass percent composition of C in glycine is 31.66%.

What is formula mass?

The formula mass of a substance is defined as the sum of the atomic masses of constituent atoms in an ionic compound. This is generally used for ionic compounds which do not contain discrete molecules, but ions as their constituent units.

Given,

Formula mass of C2H5NO2 = Molar mass of C2H5NO2

Molar mass of C2H5NO2 = 75.08 g

Futher we know that the 75.08g of glycine contain 24 g of carbon,

then mass percent composition of C in glycine can be given as,

% C = (mass of carbon/ molar mass of glycine) ×100

%C = (24/ 75.8) × 100

= 31.66%

Thus, we find that the mass percent composition of C in glycine is 31.66%.

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