Stoichiometry Help: Calculating Moles & Grams of O

[gokugreene]

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

First Problem:
A tablespoon of sugar, C_1_2H_2_2O_1_1, 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 1.555~x~10^{-5} mole of AlK (SO_4)_2~12H_2O
A.) How many grams of O are present?
Do I start by multipliying 1.555~x~10^{-5} by the molar mass of AlK (SO_4)_2~12H_2O??

Thanks

 

[Gokul43201]

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