Chemistry
Calculate the [H3O+] and pH of each polyprotic acid solution. (b) 0.116 M H3C6H5O7 I did part (a) just fine, but for some reason can't figure (b) out. Can someone help me with just the [H3O+] part to get me started? I already got 9.3e-3 and 1.4e-3 without success and only ...
chemistry 2 college
explain how to find the mass of solute in the solution: 50.0g of solvent in a 10.0% NaCl solution?
Stats
The area between the mean and a Z score of +1.50 is 43.32%. This score is higher than ___ of the score in the distribution.
Chemistry
My Chem professor is out for the weekend and I'm confused about what the question is asking or the equations needed... A 10.0-g block of pure nickel (Cp = 0.445 J/g-°C) is brought to each of the temperatures below. A sealed beaker containing 15.0 g water at the tempera...
chemistry
Ah, yes it does! Here are the three complete: (a) 2 H2S(g) + 3 O2(g) -> 2 H2O(l) + 2 SO2(g) [2(-285.8)+2(-296.8)] - [2(-20.6)] = (-571.6 + -593.6) - (-41.2) = -1124 (-1124.0?) (b) N2O4(g) + 4 H2(g) -> N2(g) + 4 H2O(g) [4(-285.8)] - [1(11.1)]= -1154.3 (c) SO2(g) + 1/2 O2(...
chemistry
I noticed that right after I wrote you, and typed in -1154.3 thinking I had solved it, but the program rejected it. I don't know any other possible answer. I did the equations the same way for all three reactions, and the third one was counted correct while the others are ...
chemistry
I saw, and it was SO helpful! Thank you!! Okay, here is how I did (b): (4)x(-285.8) - (1)(11.1)=-1150
chemistry
Use standard enthalpies of formation to calculate ΔHrxn° for each reaction. (See the appendix. Enter your answer to the tenth place.) (a) 2 H2S(g) + 3 O2(g) 2 H2O(l) + 2 SO2(g) (b) N2O4(g) + 4 H2(g) N2(g) + 4 H2O(g) (c) SO2(g) + 1/2 O2(g) SO3(g) These are so easy, but...
chemistry
Would the answer be 27kJ?
chemistry
NH4NO3(s) NH4+(aq) + NO3−(aq) In order to measure the enthalpy change for this reaction above, 1.07 g of NH4NO3 is dissolved in enough water to make 25.0 mL of solution. The initial temperature is 25.8°C and the final temperature (after the solid dissolves) is 22.4&d...
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