Question

What volume of chlorine gas at 42.0 deg C and 1.33 atm is required to react completely with 41.5 g of phosphorus according to the reaction:
P4(s) + 6Cl2(g) -> 4PCl3(l)

Answer 1

Number of moles=Mass(g)/Molar Mass(g/mol)
you can look for phosphorus atomic weight in your periodic table P=30.974
30.974*4=123.896 g/mol
Mass given: 41.5 g
Number of moles of P4=41.5/123.896=0.334

Use Ideal gas Equation
PV=nRT

Answer 2

convert all given values into appropriate unit using appropriate conversion factors like convert 42C into Kelvins, ATM into kPa and grams into moles and plug those numbers into the following formula i'm going to provide you......