Question

Calculate the number of atoms present in 240 g of H2O

Answer 1

Explanation:

18 atoms

hope it will help you

Answer 2

Answer:

1.2 * $10^{25}$

Explanation:

moles of H2O = given mass/molar mass

moles = 240/18 = 40/3 moles

no. of molecules = moles * avogadro no.

                            = 40/3 * 6.022 * $10^{23}$ = 80 * $10^{23}$

no. of atoms in one molecule of H2O = 3

total no. of atoms = 3 * 40 * $10^{23}$ = 1.2 * $10^{25}$