Question

I need help working these

Answer 1

1) 7.80 X 10^22
`(1)/(6.02*10^(23) )` = .13

2) 5.6
`(6.02*10^(23) )/(1)` = 3.4 X 10^24

3)3.81
`(1)/(74.55)` X
`(6.02*10^(23) )/(1)` = 3.08 X 10^22

4) 399.91
`(4.05*10^(23) )/(6.02*10^(23) )` = 269

5)4.32
`(1)/(18.01)` X
`(22.4)/(1)` = 5.37

Step-by-step explanation:

For 2 the correct answer is 3.4 instead of 3.2. The 3.4 is rounded from 3.37. Sadly I couldn't figure out the bonus.