minnie123 3 years ago Calculate the molarity of the solution. 29 g of NaCl (g.f.w. = 58.5 g/mol) in 0.030 liters. 0.015 M 17 M 67 M

1. afa92

First you want to find the moles of 29g of NaCl. Then you can plug it into the equation for molarity which is moles of solute/liter of solution.

2. minnie123

how do you do that???

3. afa92

Find the moles of NaCl?

4. minnie123

How do you do that?!?

5. afa92

29 g of Nacl * molar mass of NaCl= answer

6. aussy123

I think she needs you to set it up in a equation

7. afa92

I just did.

8. afa92

Then you take that answer and put it over the liters of solution.

9. minnie123

this is my question.... how would you find the molar mass of NaCl?

10. afa92

The molar mass is the sum of the atomic mass' of the Na+Cl

11. afa92

which is X grams/moles

12. aussy123

moles = given wt/mol. Wt Mol.wt of nacl=23+35.5=58.5 gm Moles = 29/58.5 = 0.495 = 0.5 moles (approx)

13. minnie123

ok... i got the molar mass as 58.442 so will i do 29 * 58.442

14. minnie123

@aussy123 you've got something a little wrong there hun

15. aussy123

Oh sorry I missed 0.015M