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JAMB Chemistry 2014 Paper

Question : 4

Total: 45

Solution:

Concept:

The combined gas law relates pressure, volume, and temperature for a fixed mass of gas.

Explanation:

Convert all temperatures to kelvin:

T_1 = 25^\circ C + 273 = 298\,K

T_2 = 75^\circ C + 273 = 348\,K

Use the combined gas law:

\frac{P_1V_1}{T_1} = \frac{P_2V_2}{T_2}

Given:

P_1 = 700\,mmHg

V_1 = 200\,cm^3

V_2 = 350\,cm^3

Substitute the values:

\frac{700 \times 200}{298} = \frac{P_2 \times 350}{348}

Solve for

P_2

P_2 = \frac{700 \times 200 \times 348}{298 \times 350}

P_2 = 467.11\,mmHg

Therefore, the new pressure is option C.

Answer:

467.11\,mmHg

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