Question

If 111.70 g of iron react with oxygen gas to produce iron (III) oxide, how many moles of oxygen gas will be needed?

Answer 1

Here is a worked example.
http://www.jiskha.com/science/chemistry/stoichiometry.html

Answer 2

determine the normality of 38g of HCI in 6.2 L of solution.
my answer 0.17
is that correct?