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Use the reaction shown to calculate the mass of iron that must be used to obtain 0.500 L of hydrogen at STP: 3Fe(s) + 4H2O(l) pr029-1.jpg Fe3O4(s) + 4H2(g

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    mols H2 needed = 0.500L/22.4L = ? at STP.
    mols Fe needed = 3/4 that (see the coefficients in the balanced equation.)
    g Fe = mols x atomic mass.

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