How to calculate how many moles of o are in 22.4 mol of fe(no3)3

Which best describes why nh4+ can form an ionic bond with cl-?

2h2s + 3o2 2so2 + 2h2o which option gives the correct mole ratios? h2s: so2 = 2: 2 and o2: h2o = 3: 2 h2s: so2 = 2: 3 and o2: h2o = 3: 2 h2s: so2 = 4: 4 and o2: h2o = 5: 4 h2s: so2 = 4: 6 and o2: h2o = 4: 4

What does the mass of 0.7891 mol of ferric oxide (fe2o3)