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First Problem:

A tablespoon of sugar, [tex]C_1_2H_2_2O_1_1[/tex], weighs 2.85g.

molar mass of sugar = 352g

molar mass of oxygen = 16g

A.) How many moles of sugar are there in a tablespoon?

(2.85g of sugar/1)(1 mole/352g of sugar)

B.) How many grams of O are there in a tablespoon?

(2.85g of sugar/1)(1 mole/352g of sugar)(16g of Oxygen/1 mole)(11 atoms of oxygen)

Am I doing those right? My teacher never went over it in class and I can't find any examples on the net.

Second Problem:

Sample A is [tex]1.555~x~10^{-5}[/tex] mole of [tex]AlK (SO_4)_2~12H_2O[/tex]

molar mass of [tex]AlK (SO_4)_2~12H_2O[/tex] = 462g

molar mass of oxygen = 16.00g

A.) How many grams of O are present?

([tex]1.555~x~10^{-5}[/tex]/1)(462g/1 mole)(16g of oxygen/1 mole)(22 atoms of oxygen)

Is this how you do it?

Thanks