Question

calculate the number of particles in 0.8g O2 molecules ​

Answer 1

No. of mole of 0.8g O2

= wt. of O2 molecules/GMM= 0.8/32= 1/40.

Hence, no. of molecules= no. of mole× Avogadro's number

( 1/40)×6.022×10^23.

Answer 2

0.8 g of Oxygen =0.02 moles of oxygen

By Avagadro number

1 mole=6.023×10^23 particles

0.2 mole = 0.2×6.023×10^23

= 1.2046×10^23

Therefore 0.8 grams of oxygen contain 1.2046×10^23 particles

Thanks

# LEARN SIMPLE BUT SIGNIFICANT