Question

Find how many moles of atoms are there in:
i) 2 g of nitrogen. ii) 23 g of sodium iii) 40 g of calcium.
iv) 1.4 g of lithium v) 32 g of sulphur.

Answer 1

here is your answer,taking n as no. of mole of atom

no. of moles = mass/atomic mass
1) Atomic mass of nitrogen is 14 gm/mole
no. of mole (n)= 2gm/14gm per mole =1/7 mole=0.142 mole of atoms

similarly

2) n = 23gm/23gm per mole = 1mole atom(atomic mass of sodium is 23)

3)n = 40gm/40 gm per mole = 1mole atom

4) n = 1.4gm/7gm per mole = 0.2 mole atom(atomic mass of lithium is 7)

5) n = 32gm/32 gm per mole = 1 mole atom(atomic mass of sulphur is 32)
HOPE ITS HELPS MATE!!

Answer 2

Heya Friend !!

Please view the solution in the attachment .

hope this helps :)

thank you :)