Question

the atomic mass of calcium is 40u what will be the number of 0.4u of calcium

Answer 1

40u contains 1 mole of Ca 
0.4u contains (0.4/40 moles) Ca = 1/100 moles
1 mole of Ca contains 6.02*10²³ atoms
so 0.01 mole of Ca contains 6.02*10²¹ atoms

Answer 2

hi Mein do urine SR Capital Public School is yes yes yes