Answer:
D. 13.44 dm³
Explanation:
Step 1: Write the balanced equation
CuO + H₂ ⇒ Cu + H₂O
Step 2: Calculate the mass corresponding to 47.7 g of CuO
The molar mass of CuO is 79.55 g/mol.
47.7 g × (1 mol/79.55 g) = 0.600 mol
Step 3: Calculate the moles of H₂ that react with 0.600 mol of CuO
The molar ratio of CuO to H₂ is 1:1. The moles of H₂ are 1/1 × 0.600 mol = 0.600 mol.
Step 4: Calculate the volume of 0.600 moles of H₂ at STP
1 mol of any gas at STP has a volume of 22.4 dm³.
0.600 mol × (22.4 dm³/1 mol) = 13.44 dm³
