Ideal gas law - Avogadro's law class exercises

IDEAL GAS LAW PV= nRT class exercises. 1. What will the volume occupied by 66g of CO2 at STP conditions? 2. Under what pressure are 96g of Oxygen O2 if the gas occupies 5L at 15°C? 3. What temperature (in Celsius °C) is a 6L cylinder that holds 70g Nitrogen N2 and reads 1368mmHg of pressure? 4. What mass of Chlorine gas Cl2  can a 10L container hold at STP conditions?