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If 36 grams of water yield 4.0 grams of hydrogen gas after a chemical reaction, how many kilograms of hydrogen gas will you obtain from 4.35 x 10^4 milligrams of water?

  • chemistry -

    36 grams of H2O is equivalent to 2 mole of H2O, and 4.0 grams of H2 is equivalent to 2 mole of H2.

    So, the reactant to product mole ratio is 1:1.

    Convert mg to g and solve for the number of moles.

    4.135 x 10^4 mg*(10^-3 g/1 mg) = H2O in g

    H2O in g *(1 mole/18.00g) = moles of H2O

    moles of H2O=moles of H2

    moles of H2*(2 g/1 mole of H2)= mass of H2 in g

    mass of H2 in g*(10^-3 kg/1g)= mass of H2 in kg

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