Chemistry Forum

I see, thank you!

Hi guys, can someone help me figure out what each of the four Sulfur's oxidation number for H2S4 is? I know H is 1 and S is 6 but I don't get how you find the individual oxidation numbers for Sulfur..

Thanks so much! I probably missed that in the textbook

Can anyone tell me what I'm doing wrong here? For the [H3O+] and [OH-], I'm calculating their pH by simply inserting the given numbers into the -log equation but I feel like that's wrong. How can I find the pH values for those ones? Thanks.

Hi guys so I am asked to calculate the volume of H2 collected at STP using the combined gas law. I have my numbers and all but I am confused on where to put it in the equation. The equation I'm using is V1=P2T1V2/T2P1. Where would I put the STP numbers in? That's the only part I'm confused about. Th...

Thanks once again

You guys have been a real help! Thank you

Hmm.. I just inserted all the values into the equation V=nRT/P. I think I made a mistake though because I got a different answer to the one I wrote before. My new answer is 0.02746 L. Still wrong..

By the way, how did you get that equation? How did you come up with that thinking?

4.50 L x 1 mol He / 22.414 L = 0.200767377 mol (not rounded up)

Another question:

A gas canister has the initial pressure of 1.00 atm at 55C then is refrigerated to -10C. What is the new pressure inside the canister?

Which laws am I using here?

I got 0.0250 L. But that was incorrect... not sure what I'm doing wrong?

Oh wow, that makes sense! Thank you!

Hey guys, I need help with this question. Super confused on it. Here it is: A balloon is inflated to 4.50 L with Helium, at a particular initial temperature and pressure. (It is tied off.) Now, assume that the temperatures and pressures referred to are always those prevailing inside the balloon. The...

hi guys, I just need help with one question..

what would happen to my percent yield if the concentration of the CaCl2 solution used in my lab was doubled? originally had 1.00 M. if it was doubled what would my percent yield be? Thanks...!