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In a laboratory experiment, H2 gas is produced by the following reaction: The H2 gas is collected over water in a gas-collection tube (eudiometer). The atmospheric pressure in the laboratory is 770 torr and the temperature of the lab and the water used in the experiment is 22°C. The vapor pressure of water is 19.8 torr at 22°C. Before measuring the volume of gas collected in the tube, which of the following is a necessary step in correctly determining the total gas pressure inside the tube?

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In a laboratory experiment, H2 gas is produced by the following reaction: The H2 gas is collected over water in a gas-collection tube (eudiometer). The atmospheric pressure in the laboratory is 770 torr and the temperature of the lab and the water used in the experiment is 22°C. The vapor pressure of water is 19.8 torr at 22°C. Before measuring the volume of gas collected in the tube, which of the following is a necessary step in correctly determining the total gas pressure inside the tube?






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