Chapter 7.7, Problem 7.55PP

The chemical reaction of hydrogen with oxygen produces water.
${\text{2H}}_{\text{2}}\left(g\right)+{\text{O}}_{\mathrm{<mn>\; 2\; </mn>}}\left(g\right)\to {\text{2H}}_{\text{2}}\text{O }\left(g\right)$

a. How many moles of ${\text{O}}_{\mathrm{<mn>\; 2\; </mn>}}$ are required to react with 2.6 moles of ${\text{H}}_{\text{2}}$ ?
b. How many moles of ${\text{H}}_{\text{2}}$ are needed to react with 5.0 moles of ${\text{O}}_{\mathrm{<mn>\; 2\; </mn>}}$ ?
c. How many moles of ${\text{H}}_{\text{2}}\text{O}$ form when 2.5 moles of ${\text{O}}_{\mathrm{<mn>\; 2\; </mn>}}$ reacts?