Question

In order to make 100 mL of a 0.512 M NaCl solution, then _________ g of NaCl is needed.

Answer 1

The formula is m=cv
Where m is the mass that you are determining, c is the concentration in this case 0.512M and v is volume (note volume is in litres so you would have to convert it)

Answer 2

so is it 2.99g ?

Answer 3

100mL=0.1L
m=cv
=(.512)(.1)
=0.0512g

Answer 4

but we're trying to make a 100mL solution of 0.512g how is the answer the same as the number in the question with one more 0???

Answer 5

0.512M*

Answer 6

Because it's 100mL solution (or 0.1L) it would change more if it was at a different volume like if it was at 200mL you would have 0.102g of NaCl in it

Answer 7

So is the answer 2.99?

Answer 8

What I did was (0.1L x 58.4 x 0.512) because there is 58.4 g/mol in NaCl

Answer 9

You don't need to put the molar mass in at all
Let's say if you did put in 2.99g of NaCl
c=m/v
=2.99/0.1
=29.9 as your concentration