Answer:
the number of mol that 60 gram of calcium will have this 1.5 mol.
as number of mole is equal to
n=w/m which is
60/40 which is 1.5 mol
and that of the number of atoms it will have will be 60 over 40 times the algorithm constant 6.223 times 10 to the power 23 which will give 9.0 345 ×10²³
