Homework Help: chemistry

Posted by Norma on Monday, July 26, 2010 at 12:03am.

What formula do I use to calculate the mass of KCl that is required to make 625 mL of a 0.200 M solution?

Dr Robb the formula you gave me didnt give me the correct answer and I think I did it wrong it is asking for the answer in grams which should be 9.3 grams but I cant get that answer no matter how I work it. Help please

chemistry - DrBob222, Monday, July 26, 2010 at 12:15am
You just didn't use it correctly.
M = moles/L
moles = M x L = 0.200 M x 0.625 L = 0.125 moles.
grams = moles x molar mass
g = 0.125 x 74.55 = 9.3187 grams which rounds to 9.32 grams KCl to three significant figures (which is what you are allowed). .
chemistry - Norma, Monday, July 26, 2010 at 12:28am
thank you so much Dr Bob I couldnt figure it out at all.

Answer this Question

Related Questions

Chemistry - What formula do I use to calculate the mass of KCl that is required ...
Chemistry - What formula do I use to figure. 16.5 g of KCL (MM=74.55 g/mol) is ...
Chemistry - 12.5 g of KCl (MM = 74.55 g/mol) is dissolved in enough water to ...
chem - What mass of KCl (MM = 74.55 g/mol) is required to make 600 mL of a 0.175...
Chemistry help - I am confused as to how to solve the below problem. I am not ...
ap chemistry - Cl2 + 2koh-->kcl _kclo +H2O 3KClo-->2Kcl+kclo3 ...
chemistry - What is the percent by mass of 3.55 g NaCl dissolved in 88 g H2O? 2...
chemistry - What is the percent by mass of 3.55 g NaCl dissolved in 88 g H2O? 2...
Chem 1010 - 15.3 g of KCl (MM = 74.55 g/mol) is dissolved in enough water to ...
Chemistry - What mass of MgSO4 · 7H2O is required to prepare 800 mL of a ...

For Further Reading

First Name:
School Subject:
Answer: