Please help! How do you calculate the "average percent yield"? I just need the formula. I already know how to find the theoretical yield and percent yield, I just don't know how to find the average or what it means by average.

The boiling point of propanoic acid is higher than that of 1-butanol because: propanoic acid has a higher molecular weight than 1-butanol. propanoic acid is more soluble in water than 1-butanol. propanoic acid is a better hydrogen bond donor than 1-butanol. propanoic acid forms hydrogen bonded dimers and 1-butanol does not. 1-butanol forms hydrogen bonded dimers and propanoic acid does not.

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

Can you me with this i really appreciate it