## anonymous one year ago When 0.422g of phosphorus is burned 0.967g of a white oxide is obtained. Determine the empirical formula of the oxide

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1. Shikamaru11

now what's that we gonna use the combustion analysis here too @Photon336 Sir???

2. Photon336

@Shalante this is your type of problem.

3. Photon336

i'm not sure myself @Shikamaru11 thoughts?

4. Rushwr

Combustion is when u burn it in air soo we have to write the balanced equation for the reaction between phosphorus and O2

5. Shikamaru11

Sir will be the equation is something like that?????????? $P+ZnO \rightarrow ????$ hope i could think far

6. Rushwr

Wait I dnt think we need to go for the equation. We can just assume that all of the phosphorus is now in the oxide.

7. Photon336

$$\color{#0cbb34}{\text{Originally Posted by}}$$ @Rushwr Combustion is when u burn it in air soo we have to write the balanced equation for the reaction between phosphorus and O2 $$\color{#0cbb34}{\text{End of Quote}}$$ yeah, was thinking that too, BTW where did the zinc come from?

8. Rushwr

Considering phosphorus as the limiting agent

9. Shikamaru11

oh I got that in a second shot I think it mentioned white oxide but it's the obtant so my hypothesis failed :P

10. Shikamaru11

hey my guess of PO4 lolxxxx :P

11. Rushwr

we only need to find the empirical formula of the oxide right? So what if we consider that all of the phosphorus present are in the oxide now ? So the rest of the mass that is from 0.967 is oxygen SO the mass of oxygen in the oxide = 0.967 - 0.422 = 0.545g We can find the no. of moles of each separately Moles = mass/ molar mass moles of P = 0.422/ 31 = 0.014 moles Moles of Oxygen = 0.545/16 = 0.034 moles Now divide each by the smallest no. of moles |dw:1444362596720:dw| Now the ratio between P: O is 1:2.5 But we can't keep the ration in decimal numbers so to make it a whole number we multiply it by 2 so the new ratio would be 2:5 So the empirical formula would be P2O5

12. Rushwr

@Photon336 @Shikamaru11 What do u think Am i wrong somewhere?

13. Shikamaru11

hmmmm point to ponderwell you've won the world CUP :) friend @Rushwr

14. Rushwr

LOL ....... Thanks !!! @Shikamaru11

15. Shikamaru11

no dude you deserve it I'll call FIFA to give you the CUP next time :D :P :D

16. Rushwr

ROFL !!!!!!!!! Okai then I'll wait for it !!! >_< @Shikamaru11

17. Photon336

omg now is a great time for a study group.

18. Rushwr

hahahahahaha Yaaaaaaaaaaaaasssssssssssss @Photon336

19. Photon336

we've got Shalante you and shika

20. Rushwr

The only 2 missing here is Tara and woodward

21. Rushwr

Didn't hear from tara lately though

22. Rushwr

SO what are we up to ? Any questions before I leave.

23. Shikamaru11

:) i think that's enough for now my left eye got blanked and this chemistry :D but have you loved somebody :P @Rushwr

24. Rushwr

lol y? @Shikamaru11

25. Shikamaru11

you asked us to questio so i did :D @Rushwr

26. Rushwr

LOL I meant chemistry ones not this !!! @Shikamaru11

27. Shikamaru11

oh Sorry sir mistake Action replay :D :P @Rushwr :) stay happy

28. Rushwr

LOL I will I will @Shikamaru11

29. Rushwr

And not sir ! Miss

30. Shikamaru11

@Rushwr sorry ma'm I asked the wrong one I didn't know that you're ma'm :)

31. Rushwr

lol oki

32. Shikamaru11

@Rushwr thanks for being nice :)

33. Rushwr

No problem !!!! :) @Shikamaru11