Anonymous
Anonymous asked in Science & MathematicsChemistry · 5 months ago

Chemistry problem?

Refer to this chemical reaction:

2NO2(g) + 7H2(g)---> 2NH3(g) + 4H20(g)

If 704L of water vapor are collected at STP, how many grams of ammonia are also produced?

2 Answers

Relevance
  • Dr W
    Lv 7
    5 months ago
    Favorite Answer

    I'd set it up like this

    .. 704L H2O @STP.. .... 1 mol H2O.. ... . ... .. . 2 mol NH3.. .. .. 17.04g NH3

    ---- ---- ----- ----- ---- x ---- ---- --- ---- ---- ---- x ---- ---- ---- --- x ---- ---- ----- --- = ___ g NH3

    .. .. .... ... 1.. .. ... .... .. 22.41 L H2O @STP.. ... 4 mol H2O.. .... .. 1 mol NH3

    just enter

    .. 704 / 22.41 * 2 / 4 * 17.04 =

    in your calculator

    **********

    yes david your math is identical.. but leaving off the units eliminates one of the best benefits of factor label method. And that is verification the problem is setup correctly.. you can eyeball my answer and see all the units cancel out leaving g NH3.. right?

  • david
    Lv 7
    5 months ago

    (704/22.4) X (2X17/4) <<< use a calculator

Still have questions? Get your answers by asking now.