Question

A sample of carbon-12 has a mass of 6.00 g. How many atoms of carbon-12 are in the sample?

3.01 × 1023

6.02 × 1023

1.20 × 1024

3.60 × 1024

Answer 1

carbon molar mass=12
carbon mass in the above question =6
mole=number of atoms/6.02x10²³
6/12= number of atoms/6.02x10²³
number of atoms=1/2 x6.02x10²³
number of atoms= 6.02 x10²³/2
number of atoms=3.01x10²³