Question

Find out no. Of molecules in 27 gm of water.
for class 9th..​

Answer 1

use the formula N/N°=m/M

N=no. of molecules/ion/atoms

N°=Avogadro no.(=6.022 ×10^23)

m=given mass in gram

M=molar mass

M for H2O :-2×1+16 =18

N÷N° =m÷M

N = m/M × N°

N = 27/18 × 6.022 × 10^23

N=9.022×10^23 molecules