write balanced chemical equations for the following...
1)barium and water react to form barium hydroxide and hydrogen gas?
2)iron metal combines with oxygen gas?
3)magnesium chloride reacts with ammonium nitrate?
4)aluminum hydroxide reacts with hydrogen phosphate?
5)aluminum reacts with silver sulphate?
6)copper (!) nitrate reacts with sodium carbonate?
7)aluminum oxides decomposes to produce aluminum and oxygen gas?
8)potassium iodine reacts with lead (! ) nitrate to produce lead (! ) iodine and potassium nitrate
9)Pb(NO3)2+K2CrO4
10)3Ga2O3-How many molecules are present in the given symbols?
-How many atoms of oxygen are present in the given symbols?
-If you were given 93.7 g of this compound how many moles of this compound would you have?
- How many atoms of gallium are present in 93.7 g of this compound?

I'm afraid that none of us will do all of this for you. You need to

1. work out what the products are
2. work out the proper equations for the reagents and products
3. form balanced equations.

Remember that Copper(!)Nitrate the (!) is actually a (I) and denotes the valency of a transition metal.

As for the lest few you need to use avagadro's number, and your knowledge of moles.