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chemistry

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146 mL of wet H2 gas is collected over water at 29.0 degrees celsius and room pressure of 750 torr. give the volume of the dry H2 gas collected at STP, give the mass of the dry H2 collected, and give the volume of the dry H2 at room conditions and the volume of H2O in the collected gas at room conditions.

could someone please please pleasee help me? i'm soo confused >.< i don't understand the whole wet/dry thingy at alllll.

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