Final answer:
To calculate the partial pressure of CH4, multiply the total pressure by the percentage of CH4.
Step-by-step explanation:
To calculate the partial pressure of CH4, we need to know the total pressure and the percentage of CH4 in the gas mixture. In this case, the total pressure is given as 307.2 kPa and the percentage of CH4 is 90.0%. We can calculate the partial pressure of CH4 by multiplying the total pressure by the percentage of CH4:
Partial pressure of CH4 = (Percentage of CH4 / 100) * Total pressure
Partial pressure of CH4 = (90.0 / 100) * 307.2 kPa
Partial pressure of CH4 = 276.48 kPa