CHEMISTRY COMMUNITY

Alex_Wagas_3K

I would like to apologize for not adding more jokes, but I only post them periodically

Alex_Wagas_3K

Alex_Wagas_3K

The average rate of the reaction N2(g) + 3 H2(g) --> 2 NH3(g) over a certain period is reported as 1.15 (mmol NH3)*L -1 *h -1 . (a) What is the average rate over the same period in terms of the consumption of H2? (b) What is the unique average rate? For part (a), I am unsure of how to go about solvi...

Alex_Wagas_3K

Question: Copper reacts with dilute nitric acid to form copper (II) nitrate and the gas nitric oxide, NO. Write the net ionic equation for the reaction. I would just like to clarify if this is the correct skeletal equation to go about solving the problem: Cu(s) + HNO_{3} (aq) --> Cu^...

Alex_Wagas_3K

Calculate the entropy change of the surroundings when 1.00 mol H₂O(l) vaporizes at 90°C and 1 bar. Take the enthalpy of vaporization of water as
40.7 kJ*mol^-1.

For this problem, you do not need to set the 40.7 kJ*mol^-1 negative because it is already given at the vaporization stage correct?

Alex_Wagas_3K

As mentioned above, it is probably a typo as without the coefficient of 2 NH₃, the chemical equation itself would be unbalanced.

Alex_Wagas_3K

One of the textbook questions list the following: Use bond enthalpies to estimate the standard enthalphy of the reaction... CCl 3 CHCl 2 (g) + 2 HF (g) ---> CCl 3 CHF 2 (g) + 2 HCl (g) The answer the the question is -24 kJ/mol, but when I try and calculate it on my own I keep getting -30 kJ/mol. I w...

Alex_Wagas_3K

Thank you for posting this, saved me quite a bit of studying.

Alex_Wagas_3K

I asked the guy sitting next to me if he had any Sodium Hypobromite…
He said NaBrO

Alex_Wagas_3K

Do we need to specify the specific p-states? For example, for C 2 , is the correct configuration: 1. (\sigma 2s)^2(\sigma* 2s)^2(\sigma 2pz)^2(\pi 2px)^1(\pi 2py)^1 or 2. (\sigma 2s)^2(\sigma* 2s)^2(\sigma 2pz)^2(\pi 2p)^2 Basic...

Alex_Wagas_3K

thank you for clearing this up, had some difficulty in this as well

Alex_Wagas_3K

Why was there a warrant out for Sodium?

It was wanted for assault (a salt)

Alex_Wagas_3K

As mentioned above, just download the lectures onto your Desktop and then you can set the playback speed on a video player such as QuickTime for Mac

Alex_Wagas_3K

So it wasn't just me that was thinking that haha nice

Alex_Wagas_3K

I had a similar question, but I am still confused about how it is 6.022X10^23 photons per mole. Is it just a known constant that just like atoms there are a certain number of photons per mole? 6.022x10^23 is a constant that can be expressed as per mole of anything. As stated above, it can represent...

Alex_Wagas_3K

To calculate the net number of moles of gas produced, you take the difference of the sum of the coefficients of the reactant by the sum of the coefficients of the product. Here is an illustrated format of how you would calculate it: Sum of Coefficients of the Product - Sum of Coefficients of the Rea...

CHEMISTRY COMMUNITY

Search found 16 matches

Re: Post All Chemistry Jokes Here

Re: Post All Chemistry Jokes Here

Self-Test 15.2A

Self-Test 14.1A [ENDORSED]

Self-Test 9.15A

Re: Quiz 1 Prep #5

Question about using mean bond enthalpies to estimate the enthalpy of a reaction

Re: D-block exceptions for midterm and f-block

Re: Post All Chemistry Jokes Here

Correct way to write molecular configuration?

Re: Fe and proteins

Re: Post All Chemistry Jokes Here

Re: Bruincast

Re: Quiz 2 Typo?

Re: HW Question Ch #27 [ENDORSED]

Re: Balancing Chem Eq Audio Visual Post-Assess #8