What is the effect of high activation energy on a chemical reaction?

Why do sodium and neon have vastly different chemical and physical properties despite having similar atomic masses?

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation:

For the reaction c6h14(g) & longrightarrow; c6h6(g) + 4h2(g), δp(h2)/δt was found to be 2.5 x 10-2 atm/s, where δp(h2) is the change in pressure of hydrogen. determine δp(c6h14)/δt for this reaction at the same time.