Question

Calculate the number of atoms present in 42 grams of carbon.​

Answer 1

Mass of nitogen molecules =42 g

Molar mass of nitogen molecules=42 g

Each nitrogen molecules contain 2 nitrogen atoms.

Moles of nitrogen molecules =

Molar mass

Mass

=

28

42

=1.5 moles

Number of atoms of nitrogen present in 42 grams of nitrogen gas =2×no. of moles×N

A

=2×1.5×6.022×10

23

=1.8066×10

24

atoms