it says: calculate the number of grams of NH3 produced when 21.0 g of H2 react with N2.

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  1. 1. write the equation and balance it. I will help.
    3H2 + N2 ==> 2NH3

    2. Convert 21.0 g H2 to moles. moles = grams/molar mass.

    3. Using the coefficients in the balanced equation, convert moles H2 to moles NH3.

    4. Now convert moles NH3 to grams. # grams = moles x molar mass.

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