Find
(I) No. of moles of cu atom In `10^(20)` atoms of cu.
(ii) Mass of 200 atoms in amu.
(iii) Mass of 100 atoms of in amu .
(iv) No. of molecules & atoms in 54 gm `H_(2)O`.
(v) No. of atoms in 88 gm `CO_(2)`.

Answer

`(i)(10^(20))/(N_(A))"moles"" "(ii)3200 "amu"" "(iii)14xx1.66xx10^(-24)100g" "(iv)3N_(a),9N_(9)" "(v)6N_(A)`