CaO + H2O --> Ca(OH)2?

Question

If 100g of Ca(OH)2 are produced, how many grams of CaO are needed?

That's an easy one and I already set it up for you -- lets see how smart ya are ;-)

You're right - I should have posted in Chem, I'm sorry :-) .....

Bellerophon - I'm impressed yes the answer is:

CaO / Ca = 40 / O = 16 eqauls 56g/m
Ca = 40 / O = 32 / H = 2 equals 74g/m

74 X 5600 = 75.67g

that and the compliment helped :-)

Alright Obiwan or whatever your name is now hehe I will think of a history question for you then, ok?

Answer 1

I am sorry I was distracted by your avatar and thought Luya's answer was correct...

From the stoichiometry 1 mole of Ca(OH)2 requires 1mole of CaO.

Thus x mole of Ca(OH)2 requires x mole of CaO.

mass CaO= mole CaO * MW(CaO)=x*MW(CaO)

But also x=mass Ca(OH)2/MW (Ca(OH)2)

so

mass CaO=mass Ca(OH)2* MW(CaO)/MW(Ca(OH)2)=
=100*56/74=75.67 g

Answer 2

sine H2O is ( 2*1 + 16 ) = 18
then CaO = 100 - 18 = 82 gm

Answer 3

Ok, I cannot compete with this kind of stuff. I am a whiz with english and composition (even some history), but this stuff hurts my head trying to figure it out. I know a little bit about everything. Not quite the Jack of all trades.

Answer 4

Yo, buddy, that's a chem question. I already took two semesters of that stuff, not counting organic I and II. I just don't feel like doing it.


*Okay, the guy below is defininitely wrong. Right track, but dead wrong.

Answer 5

I don't feel like answering your question because that avatar of yours (hope it's not you taking a bath or exercise) looks like you are not interested in chemistry; yucky! By the way, you might get some correct answer from someone else.

Answer 6

50?