CHEMISTRY

after starting with 0.343g Al and excess HCl the volume of H2 gas collected over water was 472ml. the atmospheric pressure was 754 mmHg and the temp was 21c.
1 balanced chemical equation?
2calculate the pressure in atm of dry hydrogen gas in a mixture

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  1. Ptotal = pH2 + pH2O
    Ptotal = 754 mm
    pH2O = look up the vapor pressure of H2O at 21 C. One web site shows that as 18.7 mm
    So 754-18.7 = pH2 which is pressure of the DRY hydrogen gas. Then convert that to atm.

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