Question

a)calculate the no. of
i)atoms
ii)molecules in 124 grams of phosphorus, p4 (given atomic mass of p=31.0 u,NA=6.023 into 1023 mol-1 )

Answer 1

mole=given/total molecular mass
=124/31*4. ( There are 4 atoms of phosphorus)
=1
So, 124 grams of phosphorus contains 6.023*10^23 molecules of sulphar.