Stoichiometry Help

  1. Hey could you guys tell me whether I am on the right track with this or not.

    First Problem:
    A tablespoon of sugar, [tex]C_1_2H_2_2O_1_1[/tex], weighs 2.85g.
    A.) How many moles of sugar are there in a tablespoon?

    Do I calculate the molar mass of sugar in grams and then divide 2.85g by the molar mass? To give me the moles?

    Also, if I were to calculate how many grams of O there are in 2.85g of sugar would I just multiply the number of moles in 2.85g of sugar by the molar mass of oxygen times the number of oxygen atoms?

    Second Problem:
    Sample A is [tex]1.555~x~10^{-5}[/tex] mole of [tex]AlK (SO_4)_2~12H_2O[/tex]
    A.) How many grams of O are present?
    Do I start by multipliying [tex]1.555~x~10^{-5}[/tex] by the molar mass of [tex]AlK (SO_4)_2~12H_2O[/tex]??

  2. jcsd
  3. Gokul43201

    Gokul43201 11,141
    Staff Emeritus
    Science Advisor
    Gold Member

    double-post. Question answered in homework help (K12).
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