Question

0.5 kg at H2O contains how many mole? 1) 0.02 mol 2) 0.2 mol 3)2.7x10^1 mol 4) 2.7x10^-1 mol.​

Answer 1

Answer:

number of moles = mass (g) / molar mass (g/mol)

In this case you've got 1000 g of water, which has a molar mass of 18.015 g/mol. The number of moles of water then is:

number of moles = 500 / 18.015 = 27.7546489 moles

Explanation:

Option 3 is the correct answer.