Question

a mixture of 0.220 moles co, 0.350 moles h₂, and 0.640 moles he has a total pressure of 2.99 bar. what is the pressure of h₂?
○ 0.865 bar
○ 0.969 bar
○ 0.649 bar
○ 1.03 bar
○ 1.17 bar

Explanation:

Step1: Calculate total moles

Total moles $n_{\text{total}} = 0.220 + 0.350 + 0.640 = 1.210$ mol

Step2: Find mole fraction of $\text{H}_2$

Mole fraction $x_{\text{H}_2} = \frac{n_{\text{H}_2}}{n_{\text{total}}} = \frac{0.350}{1.210} \approx 0.2893$

Step3: Calculate partial pressure of $\text{H}_2$

Partial pressure $P_{\text{H}_2} = x_{\text{H}_2} \times P_{\text{total}} = 0.2893 \times 2.989 \approx 0.865$ bar

Answer:

0.865 bar