Question

A sample of calcium contains 0.025 moles how many atoms are in this sample

Answer 1

As we know 1 mole of any substance having particles Na=6.02×10^23

So 0.025 moles of calcium having

1 mole/0.025=6.02×10^23/x

×=0.025×6.02×10^23=1.51×10^22