Chapter 9.2, Problem 10PP

In the acetylene torch, acetylene gas burns in oxygen to produce carbon dioxide, water, and energy.

$2C_2{H}_2\left(g\right)+5O_2\left(g\right)\stackrel{\Delta }{\to }4C{O}_2\left(g\right)+2H_{2}O\left(g\right)$  
a. How many moles of $O_2$ are needed to react with 2.40 mol of $C_2{H}_2$ ?
b. How many moles of $C{O}_2$ are produced when 3.5 mol of $C_2{H}_2$ reacts?
c. How many moles of $C_2{H}_2$ are required to produce 0.50 molof $H_{2}O$ ?
d. How many moles of $C{O}_2$ are produced when 0.100 mol of $O_2$ reacts’