Question

How many molecules of H2O contained in 2.48g of Na2S2O3.5H2O​

Answer 1

Answer:1 mole of Na2S2O3.5H2O=248gms

Thus 2.48gms=0.01moles

1 mole of Na2S2O3.5H2O contains 5 moles of H2O molecules

Thus 0.01 moles will contain 0.05 moles of H_2O

As we know 1 mole of any substance =6.022×1023molecules

thus 0.05 moles =3.011×1022molecules