Answer:
45.82 gm O2
Step-by-step explanation:
From your balanced equation in the first part, you can see that 2 moles propane need 7 moles O2
Find the number of moles of propane in 18 gm
mole wt of propane = ~ 12 * 3 + 8 *1 = 44 gm/mole
18 gm / 44 gm/mole = 9/22 gm/mole propane
we need 7/2 of this as O2 moles 7/2 * 9/22 = 1.432moles of O2
O2 mole weight =~ 32
1.432 moles * 32 gm/mole = 45.82 gm O2