Question

How many grams of sulfur are in 0.400 mol of H2S?

Answer 1

$H_2S = 2H + S$

This means,

1 mole of $H_2S$ contains 1 mole of Sulfur atoms.

$\therefore$ 0.400 moles of $H_2S$ contains $0.400$ moles of Sulfur atoms.

1 mole of Sulfur atoms = 32g

0.400 moles of Sulfur atoms = x

x $= \dfrac{0.400 \times 32}{1}$ g

x $= 12.8$g

$\therefore \ 12.8$g of Sulfur is in 0.400 mol of $H_2S$