Question

one atom of an element X weights 6.64 3 into 10 power minus 23 grams. no. of moles of atoms in 20 kg is​

Answer 1

Explanation:

Gram atomic mass = mass of 1 mole atoms× mass of one atom

=(6.022×10

23

)×(6.664×10

−23

)=40.01gm

Gram atoms=moles=mass/molarmass=40000/40=1000

∴ The number of gram atoms in 40kg = 1000

Hence, the correct option is C