Answer:
Know this
(i) 1mole of a substance contains 6.022 x 10^23atoms
(ii) 1mole of a substance contains 6.022x10^23molecules
Now
1.) 4.5x10²²atoms of Cu x 1mole of Cu/6.022x10²³atoms of Cu
=0.075moles of Cu.
2.) 8.5x10²⁴molecules of N2 x 1mole of N2/6.022x10²³molecules
=14.11moles of N2
3.) 0.025moles of CH4 x 6.022x10²³molecules/1mole of CH4
=1.51x10²²molecules of CH4
4.)1.26moles of Pb x 6.022x10²³atoms/1mole of Pb
=7.59x10²³atoms of Pb
5.) 0.56moles of CO2 x 6.022x10²³molecules/1mole
=3.37x10²³molecules.
That's pretty Much Everything
