Question

How many moles of H2O are in 42.0 g H2O? 2.33 mol H2O 5.25 mol H2O 6.00 mol H2O 7.56 mol H2O

Answer 1

The gram formula mass of H2O is 1*2+16=18. So the mole number of H2O is 42/18=2.33 mol. So the answer is there is 2.33 mol H2O in 42.0 g H2O.