Question

how many moles are present 99gms of water h2O​

Answer 1

H2O

H *2+ O*1

1*2+ 16*1

2 + 16

18u

therefore molar mass = 18g

number of moles = given mass / molar mass

number of moles = 90/ 18

number of moles = 5

Answer 2

Explanation: answer 5 moles

Water(H2O) has a molecuar mass of 18, this means it weights 18 g per mole. A mole is 6.0221415*1023molecules (Avogadro's number). If you have 1 g of water, you therefore have 1/18 of a mole, or 3.34*1022 molecules.