four chemistry questions involving chemical reactions moles limiting reactants

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1. For the following balance chemical reaction:

C5H12 (l) + 8 02 (g) à 5 CO2 (g) + 6 H20 (g)

How many moles of oxygen must react to form 13 moles of water?

2. For the following reaction:

N2 (g) + 3 H2 (g) à 2 NH3 (g)

How many grams of ammonia can be produced from 38.4 grams of nitrogen gas?

3. For the following reaction:

30 grams of calcium reacts with 30 grams of oxygen in the following reaction:

2 Ca (s) + O2 (g) à 2 CaO (s)

A) Which reactant is the limiting reactant?

B) What is the theoretical yield of CaO you can expect?

C) If you only get 30 grams of CaO after the reaction, what is your percent yield?

4. CaF2 (s) + H2SO4 (aq) à CaSO4 (aq) + 2 HF (aq)

If 6.00 g of calcium fluoride and 6.00 g of sulfuric acid are allowed to react:

A) Which reactant is limiting?

B) What is the theoretical yield of HF?

C) How many grams of HF will you get if you only get a 87% yield?

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