Question

(a) define one mole how it is related to avogadros constan? (b) calculed number of moles in 20g of water

Answer 1

Hey

mole means no. particals in GMW..
One mole has avagrdo no. of particles.

that means, 18gms of water have 6.023×10²³ molecules.

so, lets calculate how many molecules are there in 20 gms of water..

refer to image attached.

20 gms of water means, 1.11 moles.

HOPE THIS HELPS YOU.