How do you convert 1.55 moles of water to grams?

1 Answer
Jun 14, 2016

Answer:

By using the molar mass of water.

Explanation:

To get from moles to grams you need to use the molar mass which is the weight in grams of one mole (g/mol).

Each element has its own specific molar mass. For water (#H_2O#) take the sum of the molar masses of #2# hydrogen and #1# oxygen atom:

  • Hydrogen (#H#) = #1.008# g/mol #* 2 = 2.016# g/mol
  • Oxygen (#O#) = #15.999# g/mol
  • Molar mass of #H_2O# = #2.016 + 15.999 = 18.015# g/mol

This means that #1# mole of water weighs #18.015# gram.
But you have #1.55# moles of water, so you multiply:

  • #18.015# g/mol #* 1.55# mol = #27.9# gram