please solve this all question!!!

1- A solid silver spoon has a mass of 65.1g. The volume of the spoon is 6.2cm3. Calculate the density of silver. 2- Ammonia, NH3(g), burns in oxygen, O2(g), forming nitrogen oxide, NO(g,, and water, H2O(g). NH3(g)+O2(g)NO(g)+H2O(g) How many grams of ammonia are consumed if 1.35 moles of O2 are consumed? 3- Aluminum hydroxide is converted to aluminum oxide at high temperatures: 2Al(OH)3(s)Al2O3(s)+3H2O(g) 3.50 g of Al(OH)3 produced 1.96g of Al2O3 after intense heating. What is the percent yield of the reaction? The molar mass of Al(OH)3 is 78.00g; that of Al2O3 is 101.96g