chemistry

1. Nickel(11) chloride reacts with sodium phosphate to produce nickel(11) phosphate and sodium chloride.
    
    NiCl2(aq) + Na3PO4(aq) ------ Ni3(PO4)2 (s) + NaCl(aq)
a. Balance the equation above

b. Using the balanced equation, find out how many moles of nickel(11) chloride are required to produce 0.479 mol of nickel(11) phosphate?

c. Using the balanced equation, find out how many moles of NiCl2 are required to produced 0.45 moles of NaCl.

d. Using the balanced equation, determine how many grams of sodium chloride are formed from 12.5 grams of sodium phosphate?

e.Using the balanced equation, what is the percent yield for the reaction if 65.3g of nickel(11) chloride produces 17.5 g of sodium chloride?

2.Gasohol is a fuel additive containing ethanol (C2H6O) that combusts with oxygen (O2) to produce carbon dioxide (CO2) and water (H2O).

a. State the reactants and products for this reaction in the form of  a balanced equation.

b. How many moles of  C2H6O are required to completely react with 7.75 moles of O2.

c. If a car produces 125 g of H2O , how many grams of O2 are used up in the reaction?

d. Calculate the mass of CO2 that can be produced if the reaction of  39.0g of ethanol and suffient oxygen  has a 58.0% yield.

3. Calculate how many moles are contained in 1kilo, or 1000g , of  C17H21NO4 (cocaine).

4. Calculate the percent composition by mass of phosphorus in the following compounds.

a. Mg3(PO4)2                b. P6O15

5. Calculate the empirical formula for a  photographic fixing solution containing the following:
0.979g Na, 1.365g  S, and 1.021g O

6. Calculate the empirical formula for a compound from these percentage compositions  17.5% Na, 39.7% Cr, and 42.8% O

7. How many atoms of  oxygen are in 3.75 moles of K2SO4?