1. What is the volume of 4.50 moles of propane gas (C3H8 ) at STP?
2. How many moles of oxygen gas are there in 13.5 L of
oxygen gas at STP?
3. What volume (in L) will be occupied by 0.0035 moles of
chlorine gas at STP?

thanks so much

given:

mass of na = 115 g

excess cl2

to determine:

mass of nacl produced

explanation:

given reaction is-

2na(s) + cl2(g) → 2nacl(s)

since cl2 is in excess, na will be the limiting reagent

as per the reaction stoichiometry na: nacl = 1: 1

i.e. moles of na reacted = moles of nacl formed

now, # moles of na = mass of na/atomic mass

                                  = 115 g/23 g.mol-1 = 5 moles

therefore, moles of nacl = 5

molar mass of nacl = 58 g/mol

mass of nacl = 5 moles * 58 g.mol-1 = 290 g

ans: amount of nacl produced = 290 g

the answer your looking for is c).