When hydrogen sulfide is heated, it decomposes according to the equation, 12.8 g of sulfur are formed.

When hydrogen sulfide is heated, it decomposes according to the equation, 12.8 g of sulfur are formed. Find the mass of hydrogen sulfide.

Decision:
1. Let’s write down the reaction equation:
H2S = S + H2 – the decomposition reaction of hydrogen sulfide occurs when heated to 400 degrees, thermal decomposition occurs, sulfur and hydrogen are released;
2. Let’s make calculations using the formulas:
M (H2S) = 1 * 2 + 32 = 34 g / mol;
M (S) = 32 g / mol;
Y (S) = m / M = 12.8 / 32 = 0.4 mol;
3. Let’s make the proportion:
X mol (H2S) – 0.4 mol (S);
-1 mol -1 mol hence, X mol (H2S) = 1 * 0.4 / 1 = 0.4 mol;
4. Let’s calculate the mass of hydrogen sulfide:
m (H2S) = Y * M = 0.4 * 34 = 13.6 g.
Answer: to carry out the reaction, hydrogen sulfide weighing 13.6 g is required.