Question

What is the percent of H inNH3?(H = 1.008 amu, N = 14.01 amu)=

Answer 1

In order to find the percentage of an element within a compound, we need to have the mass for this element and also the mass of the whole compound, and the masses are:

H = 1.008 g/mol or amu

and we have 3 H in the compound, therefore = 3.024 g/mol or amu

NH3 = 17.031 g/mol

Now we know that 17.031 is the total mass, so we will call it 100%

17.031 g/mol = 100%

3.024 g/mol = x %

x = 17.75% of H in NH3