# Stoichiometry Help

1. ### gokugreene

47
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

2. ### Gokul43201

11,141
Staff Emeritus
double-post. Question answered in homework help (K12).

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