A mixture of carbon monoxide and hydrogen (synthesis gas) has a density of 0.625 g/l at STP. Find the volume ratio of CO to H₂ in the mixture.
- 1:1
- 1:2
- 1:3
- 2:1
📝 Detailed explanation
Molar mass of mixture = 0.625 × 22.4 = 14 g/mol.M(CO) = 28, M(H₂) = 2.
Let x be volume fraction of CO.
28x + 2(1-x) = 14.
26x = 12.
x = 12/26 ≈ 0.46.
This is close to a 1:1 ratio (which would give (28+2)/2 = 15).
Calculation for 1:1: 14 is exactly half of 28, but hydrogen is 2.
For 1:1, M_avg = 15.