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Chemical quantities

I need the exact steps that are involved in solving each of these problems and how to arrive at the answers step by step so I can grasp the concept clearly. Thanks. It is very important that I see each step.

1. The gaseous hydrocarbon acetylene, C2H2, is used in welders torches because of the large amount of heat released when acetylene burns with oxygen, producing carbon dioxide and water.First, write a balanced equation for the combustion of acetylene in oxygen. then, how many grams of oxygen are needed for the complete combustion of 150 grams of acetylene. How many carbon dioxide molecules are formed in this reaction.

2. With the news that calcium deficiencies in many women's diets may contribute to the development of osteoporosis, the use of dietary calcium supplements has become increasingly commen. Many of these calcium supplements consist of nothing more than calcium carbonate. When a calcium carbonate tablet is ingested, it dissolves by the reaction of stomach acid, which contains hydrochloric acid. The unbalanced equation for this reaction is CaCO3 +HCl ----> H2O +CO2. What mass of HCL is required to react with a tablet containing 500 milligrams of calcium carbonate?

3.the formula for thionyl chloride is SOCL2. this compound is a very powerful drying agent in the synthietc chemistry industry in that it reacts completly with water according to the following unbalanced equation: SOCl2 +H2O----> SO2 +HCL. How many water molecules can 35.0 grams of thionyl chloride remove?

4.An experiment that led to the formation of the new field of organic chemistry involved the synthesis of urea, CN2H4O by the controlled reaction of ammonia and carbon dioxide: gaseous ammonia + gaseous carbon dioxide -----> solid urea + liguid water. What is the maximum yield of urea in moles when 100 grams of ammonia and 100 grams of carbon dioxide are reacted?

5. One process for the commerical production of baking soda, sodium hydrogen carbonate, involves the following reaction: aqueous sodium chloride + gaseous ammonia + solid solium hydrogen carbonate. Because they are relatively cheap, sodium chloride and water are typically present in excess. What is the theoretical yield of sodium hydrogen carbonate when one performs such a synthesis using 10.0 grams of ammonia and 15.0 grams of solid carbon dioxide, with an excess of water and sodium chloride?

6. If an instructor takes samples of iron and sulfer and just mixes them together, the two elements can be seperated from on another with a magnent. If the instructor then combines and heats the mixture of iron and sulfer, a chemical reaction takes place and the elements combine to form iron(II) sulfide, which is not magnetic. First, write a balanced equation for this reaction. Then calculate the theoretical yield if 5.25 grams of iron is reacted with 12.7 grams of sulfer. Finally, calculate the % composition of the newly formed compound.