Question

What is the molarity of a NaCL solution that has 58 grams of NaCl dissolved in 4.0 liters of water?

Answer 1

molarity=

# of moles/liters of solute

Answer 2

How many moles is it if there is 58 grams? (Or how do I find that out?)

Answer 3

Find the molar mass of NaCl.

given mass/formula mass

Answer 4

Na=roughly 22 grams
Na=roughly 35 grams

Answer 5

*cl is roughly 35 grams

Answer 6

So 58/57=1 ?

Answer 7

Yeah, basically.

Answer 8

Now, there is 4 liters in the solute.

1/4=?

from there, just remember molarity is measured as M

Answer 9

First you need to get the grams given into moles, because molarity is defined as moles per liter, meaning: \(\sf \large \color{red}{\frac{mol}{L}}\) which means you will be dividing.

So, you have 58 grams of NaCl, and divide by the molar mass, this should give you _____ moles of NaCl.

Answer 10

Next, divide that number by 4.0 L of H\(_2\)O
because molarity is moles of solute divide by liters of solution.