Question

calculate the number of molecules present in 10g hydrogen (molecular mass=2)​

Answer 1

Answer:

1 mole of H2O has 18 g of mass

Thus 10 g of H2O contain=181×10moles

1 mole contains 6.022×1023 molecules

Thus no. of molecules in 10 gof H2O is 1810×6.022×1023 molecules =3.34×1023 molecules of H2O

Answer 2

Answer:

30.115× 10^23 molecules

Explanation:

1: 10 g = 10/2 = 5 moles.

2: 5 x 6.023 x 10^23 molecules

3: 30.115× 10^23 molecules