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chemistry

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how many grams of magnesium are required to liberate 250 cm3 of Hydrogen gas from HCL

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    Mg + 2HCl ==> H2 + MgCl2
    You want 250 cc H2. I assume that's at STP. mols H2 = 250 cc x (1 mol/22,400cc) = ?
    Convert mols H2 to mols Mg using the coefficients in the balanced equation.
    ?mol H2 x (1 mol Mg/1 mol H2) =- ? mol H2 x (1/1) = ? mols Mg.
    Now convert mols Mg to grams. g = mols x molar mass.

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