Question

What is the percent composition (by mass) of nitrogen in N₂S₂?

Answer 1

Molar mass of N2S2 = (14x2) + (32x2) = 92g/mol

Molar mass of nitrogen in N2S2 = 14 x2 = 28g/mol

% by mass of nitrogen = $\dfrac{28g/mol}{92g/mol}x100$ = 30.43%