A reaction produces 0.885 moles of H2O . How many molecules of H2O are produced?

Answer 1

Avogadro's number (6.022 x 10²³) tells you how many items are in a mole so that means there are 6.022 x 10²³ molecules in 1 mole of H₂O.

So if the reaction only produces 0.885 moles, then there is (0,885)(6.022 x 10²³) = 5.33 x 10²³ molecules of H₂O in the 0.885 moles of H₂O.