home > q&a board > chemistry > topic: volume of h2o needed to hydrate 20 kg quicklime?

Q BgQuestion:

Rookie
Karma Points: 0
Respect (100%):
posted by  bubbl3 on 11/24/2007 11:28:19 PM  |  status: Closed  

volume of H2O needed to hydrate 20 kg quicklime?

Course Textbook Chapter Problem
N/A N/A N/A N/A
Question Details:
Cement used in mortar & the making of concrete uses a monohydrate of CaO (often called quicklime).  

CaO + H20 → CaO •  H20               

What volume of water is required to hydrate a standard 20 kg bag of quicklime?
 
plz & thx!

AAnswers:

Answer Question
Expert
Karma Points: 1,187
posted by bookworm2 on 11/24/2007 11:47:54 PM  |  status: Live
Asker's Rating: Lifesaver   
bubbl3's comment:
"thank you very much bookworm2!"
Response Details:
20 kg = 20,000 g
Molar mass = 40.08 + 16 = 56.08 g/mol
 
moles of quicklime
n=m/M
n=20,000g / 56.08g/mol
n= 356.6moles
 
The quicklime and the water react in a 1:1 molar ratio.  This means that you will require 356.6 moles of water.
Molar mass of water  2*1.01 + 16 = 18.02g/mol
m=n*M
m= 356.6moles*18.02g/mol
m=6426.5g
 
Assume that 1g water = 1mL
6426.6g = 6426.6mL = 6.43L
Answer Question
Ask New Question

Join Cramster's Community

Cramster.com brings together students, educators and subject enthusiasts in an online study community. With around-the-clock expert help and a community of over 100,000 knowledgeable members, you can find the help you need, whenever you need it. Join for free today » How Cramster is different from tutoring »

Need Help In

Useful Links