Chemistry 1

[RoosterFosho]

I really can't figure out this question on my lab paper, Calculate the volume of hydrogen gas that could be produced through 5.0 g of zinc at STP. Now I really don't understand anything in this class, any help would be GREATLY appreciated.
Thanks
Rooster

[SubtleScream]

Sorry, this question goes right over my head. Is this university level chemistry?

[RoosterFosho]

Nope I'm in high school haha, but my teacher treats us like we are an AP class. I think I need to get the moles of the zinc, but then I don't know the formula from there.

[SubtleScream]

Well, based on my experiences, dumping an element in a container doesn't result in the creation of another element (unless we're talking about nuclear decay, which is completely different than what this question is asking). There needs to be a reaction involved.

You said this was for a lab paper, right? Did you just do a reaction involving acids of any sort?

[CRiSP]

Umm I know a little but never went over anything about STP but..

Looks like you'd go from 5.0g Zn(1 mole/65.38g Zn)
Hydrogen gas i'm assuming is H2 so then you would do the conversion of (2 Moles H2/1 Mole Zn)
Then (2.016g H2/ 1 mole)
That's what i would of done to find it in grams.. don't have a clue at all what you're supposed to do with STP problems.

[SubtleScream]

Umm I know a little but never went over anything about STP but..

Looks like you'd go from 5.0g Zn(1 mole/65.38g Zn)
Hydrogen gas i'm assuming is H2 so then you would do the conversion of (2 Moles H2/1 Mole Zn)
Then (2.016g H2/ 1 mole)
That's what i would of done to find it in grams.. don't have a clue at all what you're supposed to do with STP problems.
That doesn't make sense. You have to put the two components into a chemical equation before you can "do the conversion" when it comes to their moles.

[pLaGuE_90]

Are you sure there weren't any other elements combined with Zinc or Hydrogen? Otherwise, the equation doesn't make any since.

[metsrule27]

sry i took nyc hs chem last year dont member a thing

[Evil_Friar]

I really can't figure out this question on my lab paper, Calculate the volume of hydrogen gas that could be produced through 5.0 g of zinc at STP. Now I really don't understand anything in this class, any help would be GREATLY appreciated.
Thanks
Rooster

I suppose it's kind of late to help with that now, but if it's a lab paper wouldn't it be in reference to the lab? It would help to know what you did in the lab because without that background we cannot know what you mixed zinc with. But, here's an example of how to solve something if it asks about gas produced at STP.

If the reaction is:
2HCl + 2Zn --> 2ZnCl + H2

Then for every mole of hydrogen gas produced, 2 moles of zinc metal are used up. So convert the 5.0g to moles, divide it by the gfm of Zn, which is 65.4 g/mol and you get 0.076 mol. If the reaction is at STP (Standard temperature and pressure, 1C & 1atm) then you can just multiply the number of moles by 22.4L, which is the volume 1 mole of gas will occupy at STP. But, be careful, it's asking for the volume of hydrogen gas, so you have to multiply by the number of moles of H2 produced, which is 0.038 moles in this reaction (provided there's an excess of HCl). So basically 0.038 mol * 22.4L = 0.85 L of hydrogen gas produced.