## HW Problem 1.25 (6th Edition)

$E=hv$

Heidi Ibarra Castillo 1D
Posts: 60
Joined: Fri Sep 28, 2018 12:19 am

### HW Problem 1.25 (6th Edition)

Does anyone know how to go on solving part b and c for this problem?

katherinemurk 2B
Posts: 68
Joined: Wed Nov 15, 2017 3:02 am

### Re: HW Problem 1.25 (6th Edition)

For part b, convert 5.00 mg to g. Then using the equation m=nM, find n, which is amount in moles. Then use the equation N=nNa to find N, which is number of sodium atoms. Use the answer from part a and multiple that number by the number of sodium atoms.
For part c, just divide the answer from part a by Avogadro's number.

Keshav Bhatnagar 1H
Posts: 32
Joined: Fri Sep 28, 2018 12:17 am

### Re: HW Problem 1.25 (6th Edition)

Convert from Mg to moles to atoms, so 0.0050g x 1mol/22g x 6.022(10^23)/1 mol. Multiply this value by the answer you got in part A.

For part C, it is the same thing. All you have to do is multiply by avogadros number then multiply that value by the answer you got in part A.

Hope that helps!