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[bayan also]

A sample of hydrogen gas was collected over water at 21°C and 685 mmHg. The volume of the container was 7.80 L. Calculate the mass of H2(g) collected. (Vapor pressure of water = 18.6 mmHg at 21°C.)


A. 0.283 g
B. 0.572 g *
C. 0.589 g
D. 7.14 g
E. 435

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