## OpenSessame one year ago Ammonia, NH3, is produced through a combination reaction involving N2(g) and H2(g). If 24.0 mol of H2(g) react with excess N2(g), how many moles of ammonia are produced?

1. OpenSessame

I need to know how to solve this, I'm a bit rusty on my moles.

2. wolfe8

First, make sure the equation is balanced. Next, can you find the number of moles of whatever substance you have? Use this: http://www.ptable.com/

3. wolfe8

I mean, write a balanced equation first.

4. OpenSessame

So..$N _{2}(g) + h _{2}(g) \rightarrow NH _{3}$

5. OpenSessame

Is that the right equation?

6. OpenSessame

$N _{2}+3H _{2} \rightarrow 2NH _{3}$

7. wolfe8

Oh my the equation editor is not working for me but I can see it. From here can you just use normal typing? Notice that the equation is not balanced. You have 2 N on the left and one on the right. And you have 2 H on the left and 3 on the right.

8. OpenSessame

so N2 + 3H2 = 2NH3

9. wolfe8

Right. So now, you know how much H2 you used. Can you fine the number of moles of it? http://erhs.rcsnc.org/UserFiles/Servers/Server_4766394/Image/Donna%20Scofield/mole%20conversion%20map.bmp

10. OpenSessame

Uh...Walk me through?

11. wolfe8

Sure. Do you know how to find the number of moles?

12. OpenSessame

I know a mole is 6.02 * 10^23 thats about it

13. wolfe8

That is the Avogadro number - the number of objects in 1 mole of substance. But I'm sorry I misread the question. You are already given the number of moles. So here, from our balanced equation N2 + 3H2 = 2NH3 we can see that 3 parts of H2 produces 2 parts of NH3. What do you think we will do to get the moles of NH3?

14. OpenSessame

Theres some formuala...

15. wolfe8

Nah. You have 24 mol which equals to 3 parts. Find for one part and multiple by 2 to get the mols of NH3

16. OpenSessame

Uhm...One part meaning?

17. wolfe8

One proportion by ratio

18. OpenSessame

Can you show me, I feel so lost...

19. wolfe8

Sure. So 24 mol is equal to 3 parts of H2 we use based on the equation so we divide 24 by 3. Then we know we get 2 parts of NH3 from the equation so we multiply it by 2

20. wolfe8

24/3*2 Get it? Want me to show it where there's whiteboard and mic?

21. OpenSessame

Yeah!

22. OpenSessame

so would it be 4 as the final answer?

23. wolfe8

Yeah. 4 mols. Do you understand what we did though?

24. wolfe8

NOOOOOO. 24/3 is 8 multiplied by 2 is 16

25. OpenSessame

You know there is 24 mol. In 3 equal parts oh H2 and 2 equal parts of NH3?

26. OpenSessame

Where do you get that information though? and oh okay just error in what comes first! sorry

27. wolfe8

Right. This is why we always need the balanced equation for stoichiometry.

28. OpenSessame

Can you show me on the whiteboard?

29. wolfe8

Sure. Can you make a meeting on twiddla.com ? I can't because I already made one. Sent the link to me in PM

30. OpenSessame

Actually its okay! i think i understood! Thanks so much for the help

31. wolfe8

Alright good job. Have a good night