Question

The actual weight of a molecule of water is
(1) 18 gm
(2) 2.99 x 10-23
(3) both (1) and (2) are correct
(4) None of these
plz explain with soln​

Answer 1

Explanation:

2) 2.99 ×10-23...the sol. is we knew,n=m(mass)÷M(molar mass=18) and also n=no. given÷avogadro's no. therefore m÷M=N÷avag.no. and we knew M=1 therefore 'm' will be equal to M÷avag.no. i.e 18÷avag.no. which will be approx. equal to option C.