. Which of the following correctly identifies the number of each element involved in the chemical formula (NH4)2CO3

a. N:2 H:4 C:3 O:3

b. N:2 H:4 C:1 O:3

c. N:2 H:8 C:0 O:3

d. N:2 H:8 C:1 O:3

In order to determine percent composition of the elements in a compound, the molar mass (MM) of each element is divided by the MM of the compound and multiplied by 100.

% composition of element=MM of elementMM of compound×100

The molar mass of ammonium carbonate ((NH4)2CO3) is 96.086 g/mol. (Determined by multiplying the subscripts of each element times its MM using its atomic mass in g/mol on the periodic table.)

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