DrgnAngel
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Help with Chemistry
What mass of hydrogen, in grams, is needed to react completely with 892 g of N2?
N2 + H2 -----> NH3
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vulture
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1) Pick an appropriate topic title. Have a bit of mercy with people that are using the searchengine to find threads.
2) This is an extremely basic question and you should be ashamed for asking it. We're www.sciencemadness.org and www.I-am-too-lazy-to-solve-my-homework.com
One shouldn't accept or resort to the mutilation of science to appease the mentally impaired.
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DrgnAngel
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Yes, it might be a basic question for you, but I am having problems solving it. Yes I have tried, and I just don't understand how to solve it.
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DrgnAngel
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Also, I'm not too lazy to do my work. I would rather have someone help me out on how to solve it then just solve it for me. I would like to learn
on how to solve it.
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JohnWW
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Learn your atomic weights. These are given in various periodic tables of the elements, which are available on the internet, as well as many textbooks
and handbooks. Then you will be able to work out the problem.
John W.
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vulture
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Your own fault...
If you would have provided a pathway and then indicated where exactly you got stuck I wouldn't have to make such a comment...
BTW, use the edit button instead of doubleposting.
One shouldn't accept or resort to the mutilation of science to appease the mentally impaired.
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thunderfvck
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So pathetically easy.
Moles (mol) = mass (g) / molar mass (g/mol)
First order of business is to balance the equation. Make it so you have equal numbers of elements on both sides.
Then find out how many moles you have with that number and see how many moles of other stuff you'll need.
Then shake your head in shame, because this kind of question is very easy. Any simple search on stoichiometry (sp) will give you all you need to know.
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DrgnAngel
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Like I said before this type of question might be easy for you, but not me. I'm just beginning to learn chemistry, so it is a harder question for
me.
I'll show you how I'm working it out and I would apperciate it if someone would help me out and tell me what I'm doing wrong.
N2 + 3H2 ---> 2NH2
Atomic mass of N2 = 28.01345
Atomic mass of 3H2 = 6.04764
?mol N2= 892 g N2 * 1 mol N2/28.01345 = .0314052 mol N2
.0314052 mol N2* 1 mol 3H2/1 mol N2
= .0314052 mol 3H2
.0314052*6.04764= .189927
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vulture
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Your math is wrong.
Multiplication with 1/28 is the same as dividing through 28....
One shouldn't accept or resort to the mutilation of science to appease the mentally impaired.
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DrgnAngel
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thank you.....so i was just making a stupid mistake..my fault
but I do have another question
what mass of quicklime (calcuim oxide), is kg, can be made when 4.72x10^9 g of limestone (calcuim carbonate) is decomposed by heating?
CaCO3 ----> CaO + CO2
I'm not sure on how to start this, so any help would be appreciated.
[Edited on 27-9-2004 by DrgnAngel]
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vulture
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I'm getting very sceptical about this, because it seems you haven't learned much from the previous excercise it seems....
Anyways, convert it all to moles and you're done.
One shouldn't accept or resort to the mutilation of science to appease the mentally impaired.
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thunderfvck
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Sorry for being rude earlier, butn this kind of question is very, very, VERY easy...
Don't even bother asking us to help you, search for high school chemistry or something. They will tell you how to do the problem step by step. It
shouldn't be hard to understand.
After doing that, if you still have trouble, I guess you coukld come back. But try learning it yourself first! It's not hard at all!
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