Please help me ASAP, this is urgent, please give detailed solution

Question

Carbon monoxide gas reacts with oxygen gas to form carbon dioxide gas.
a. What volume of oxygen will completely react with 3.5 L of carbon monoxide if the temperature and pressure were the same?
b. What volume of oxygen gas would be required to form 20.5L of carbon dioxide?
c. If the reaction was measured at STP, how many grams of carbon dioxide gas would form from 17.8 L of carbon monoxide gas?

Answer 1

2CO + O2 ==>2CO2

(a)  Use stoichiometry.  Ratio of CO : O2 is 2:1, so can you figure out how much O2 is needed to react with 3.5 L CO?

(b)  Use stoichiometry.  Ratio of CO2 : O2 is 2:1.

(c)  Use PV = nRT to find moles of CO2 and then convert to grams