Science Homework Help

Silver (i) carbonate was decomposed by heating 948 ml of CO2 gas, collected over water 19.0 celsius and a pressure of 748.6 mmHG. 

A) write a balanced equation for this reaction

b) calculate how many grams of  carbon dioxide were collected?

c) assuming all the silver (i) carbonate decomposed, what mass of silver (i) carbonate did you start with?

please explain, i really dont understand the steps to this problem! thank you!