Question

Hydrogen sulfide, H2S, is a flammable gas with an odor like rotten eggs. How many moles of hydrogen sulfide are in 1.47 g of hydrogen sulfide?

Answer 1

The molar mass of H₂S is:

$M(H_2S)=2*M(H)+M(S)=2*1g/mol+32g/mol=34g/mol$

Thus, the amount in moles of 1.47 g of H₂S:

$n(H_2S)=\frac{m(H_2S)}{M(H_2S)}=\frac{1.47g}{34g/mol}=0.043mol$