Question

A sample of oxygen gas its mass is 32g contains..........
A)6.02×10power 23
B)the same no. of oxygen atoms found in 18g of water
C)the same no.of oxygen atoms found in 36g of water

Answer 1

32 g O2 contains 6.02E23 molecules of O2 or 12.04E23 atoms of O.
18 g H2O contains 6.02E23 molecules of H2O or 6.02E23 atoms of O.
36 g H2O contains 12.04E23 molecules of H2O or 12.04E23 atoms of O.