Asked by Brendon

What mass of KCl (MM = 74.55 g/mol) is required to make 750 mL of a 0.275 M solution?
Answered by DrBob222
How many mols do you want? That's mols = M x L = ?

Then mols = grams/molar mass. You know molar mass and mols, solve for grams.
Answered by Brendon
i'm still not getting the correct answer
Answered by DrBob222
I can't guess what you've done. Post your work and I'll find the error.
My first guess is that you didn't convert 750 mL to 0.750 L.
Answered by Brendon
.20625
Answered by DrBob222
That doesn't help. What you posted is your answer. What I need is your WORK. I need to see your work to find your error; however, I think I see what you did (with a little help from my crystal ball).
You followed half of my instructions and quit. You need to look at the second step.
The first step is to find mols and you've done that. mols = M x L = 0.750 x 0.275 = 0.20625.
Now mols = grams/molar mass
You know mols = 0.20625 and you know molar mass is 74.55 (from the problem); solve for grams KCl and you'll have it. Remember to round your answer to three places.
There are no AI answers yet. The ability to request AI answers is coming soon!