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### Topic: Chemistry problem  (Read 2317 times)

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#### dedoFilip

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##### Chemistry problem
« on: December 08, 2015, 06:41:03 PM »
Hello guys, i am new to this forum. I am stuck on a chemical problem for quite a while now, and have decided to ask for some help since i could not solve it on my own. So, here's the thing.
If 9 * 10-2 mol/L NH3 is consumed in 3 minutes according to the reaction 4NH3(g) +5O2(g) = 4NO(g) + 6H2O(g) what is the rate of formation of NO(g) and H2O(g) in mol/L * s.
The problem here is, that in order to calculate the rate of formation, i need either the mass (m) / amount of substance (n) / number of particles (N) / volume (v) and i have none of those. The only things i have are the concentration (c) of NH3 which is 0.09 and molar mass of NH3 (which is 17). Could any of you help me somehow, or tell me some equations to find some of those missing constants? I could never say thank you enough if so. Cheers, Filip!

#### Corribus

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##### Re: Chemistry problem
« Reply #1 on: December 08, 2015, 07:34:46 PM »
If we assume the volume doesn't change (i.e., the reaction happens in a closed vessel) then the volume cancels out. You can assume, say, 1 L. Then it just becomes a stoichiometry problem where your quantity consumed is given in moles.
What men are poets who can speak of Jupiter if he were like a man, but if he is an immense spinning sphere of methane and ammonia must be silent?  - Richard P. Feynman

#### Vidya

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##### Re: Chemistry problem
« Reply #2 on: December 08, 2015, 08:46:04 PM »
Hello guys, i am new to this forum. I am stuck on a chemical problem for quite a while now, and have decided to ask for some help since i could not solve it on my own. So, here's the thing.
If 9 * 10-2 mol/L NH3 is consumed in 3 minutes according to the reaction 4NH3(g) +5O2(g) = 4NO(g) + 6H2O(g) what is the rate of formation of NO(g) and H2O(g) in mol/L * s.
The problem here is, that in order to calculate the rate of formation, i need either the mass (m) / amount of substance (n) / number of particles (N) / volume (v) and i have none of those. The only things i have are the concentration (c) of NH3 which is 0.09 and molar mass of NH3 (which is 17). Could any of you help me somehow, or tell me some equations to find some of those missing constants? I could never say thank you enough if so. Cheers, Filip!
In this case moles /L is given and you can use balanced equation to convert moles/L of NH3 to mole/L of the NO or H2O
as you see in balanced equation 4 moles NH3 gives 4 moles of NO .This information is sufficient to solve this problem.