chemistry help needed?

Question

calculate:
#1) number of atoms in 2.0mol of sodium atoms

#2) molecules in 0.10 mol of nitrogen molecules

#3) atoms in 20.0 mol of carbon atoms

#4) molecules in 4.2 mol of water molecules

#5) atoms in 1.0 x 10^-2 mol of iron atoms

#6) molecules in 4.62 x 10^-5 of COv2
molecules

Answer 1

do ur homework yourself.

Answer 2

Just multiply the number of moles by Avogadro's number, 6.023 x 10^23.

The only thing you need to watch out for is if they do something tricky (which they haven't in these questions), like:
"calculate the number of atoms in 4.2 mol of water molecules"
Multiplying by Avogadro's number in this case will give you the number of molecules, not the number of atoms; you have to multiply again by the number of atoms in a water molecule (i.e. 3) to get the total number of atoms.

Answer 3

1)1.246x10^24
2)6.023x10^22
3)6.023x10^23 X 20

there is 6.023X10^23 atoms in a mole it doesn't matter what the substance is

Answer 4

1) 2NA
2) 0.2 NA
3) 20 NA
4) 4.2 NA
5) 10^-2 NA
6) 4.62x10^-5 NA

Answer 5

- Number of Particles = (6.02*10*23) * Number of Moles