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Multiple Choice
If the atmospheric pressure is 755 mmHg, and gas A is inside a closed-end 645 mm tube, what is the pressure of gas A in mmHg?
A
1400 mmHg
B
755 mmHg
C
110 mmHg
D
645 mmHg
Verified step by step guidance
1
Understand that the problem involves a closed-end manometer, which measures the pressure of a gas relative to atmospheric pressure.
Recognize that the atmospheric pressure is given as 755 mmHg, and the height of the mercury column in the closed-end tube is 645 mm.
In a closed-end manometer, the pressure of the gas is equal to the difference between the atmospheric pressure and the height of the mercury column.
Calculate the pressure of gas A by subtracting the height of the mercury column from the atmospheric pressure: \( P_{\text{gas A}} = P_{\text{atm}} - h \).
Substitute the given values into the equation: \( P_{\text{gas A}} = 755 \text{ mmHg} - 645 \text{ mmHg} \).