Chemistry mole, molecule, grams, etc. HELP!?

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bellyfat

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Help. I have read the chapter and I am totally lost :)

1) How many moles of sugar, C12H22O11, are present in 5.00- pound bag of sugar?

2) How many atoms of gold (Au) are in pure a gold bracelet that weighs 75.0 grams?

3)Water is decomposed into hydrogen (H2) gas and oxygen (O2) gases according to the following balanced equation. Answer the questions below regarding what would be produced if .50 moles H2O undergoes decomposition:
2 H2O(1)ïƒ*2 H2(g) + O2(g)
a)How many moles of O2 are produced when 5.0 moles of water are decomposed?
b)How many grams of H2 are produced when 5.0 moles of water are decomposed?

4) How many grams of salt, NaCl, can be produced by the reaction of 10.0 grams of Na and 10.0 grams of Cl2 in the following reaction?
2Na(s)+ Cl2(g) ïƒ* 2NaCl (s)
 
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