Chemistry

22mL of hydrogen was collected over wter at 19C and 745mmHg. What mass of magnesium is reacted (1:1 mole ratio)

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  1. 1:1 ratio for what?
    Mg + 2HCl ==> H2 + Mg.

    Use PV = nRT and solve for n = number of mols at the conditions listed.
    For P you want dry H2 and not wet H2 (it was collected over H2O and will be wet).
    Ptotal = 745
    pH2O = look up vapor pressure H2O at 19C.
    Pdry H2 gas = 745-vapor pressure H2O = ?
    Convert P to atmospheres.
    Convert T to kelvin.
    Convert mL to L.
    Solve for n = mols H2.
    That is mols Mg also.
    Then mols Mg = grams/atomic mass. You know atomic mass and mols, solve for grams.

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