Question

If 112 cm³ of hydrogen sulphide is mixed with 120 cm³ of chlorine at STP, what is the mass of sulphur formed?
H₂S + Cl₂ → 2HCI + S

Answer 1

At STP, 22400cm³ of each H₂S and Cl₂ will give 32g of sulphur i.e.
44800 cm³ of H₂S + Cl₂ gives = 32g of S
(112 +120) = 232cm3 of H₂S + Cl₂ will give = 32 x 232 / 44800 = 0.16g of S