An unknown compound weighing 6.5 Mg gave on combustion 20.47 Mg CO2 and 8.36 Mg H2O at 100°C and 760 mm Hg pressure 0.284 Mg of the compound occupied a volume of 100 mL Calculate the percentage composition Determine the empirical formula and molecular formula of the compound
This helps so much!! I have ALEK quizzes and since I’m taking the summer session, he didn’t put this on the practice HW on ALEK so seeing people get this on the quiz put me in for a loop but this helped me understand the concept more and hopefully I can get that one more 100% I need! Thank you!!
Thank you so much Sir, I appreciate your video and the time and effort of explaining it for better understanding. I have been seriously struggling with this but just by watching this video it was easy to understand. Thank you once again, God bless you.
For anyone confused about the last part. First he solved for k given experiment 1. Given rate equation: Rate= k[P4]^2. First isolate k: K=rate/[P4]^2. Then plug in experiment 1 data which is k=(3.19*10^-4)/(0.0110)^2 = 2.636 = 2.64. Then plug in 2.64 to the original rate equation to look like this: Rate = 2.64*[P4]^2. Question c is asking to solve for the rate given P4 and H2 concentrations. Plug in both (H2 will end up being just 1 since H2^0 = 1 which is why I didn't write it before). The equation should look like this: Rate = 2.64*[0.242]^2. This equals 0.155. Thanks!
Hi! If I'm understanding your question correctly - I think the easiest explanation is that we should treat these as two separate problems, and in the second one we're really setting things up "from scratch" aka "starting the calculation over" - you are right to think that the Br- ion is going into solution based on the Ksp calculation, but that is sort of being automatically taken into account in the second calculation when we combine the equilibrium expressions. I hope that makes at least a little bit of sense!
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i know this video is 8 years old but I am really confused about a homework question I have, where part of the water freezes after adding the ice and I'm struggling to visualise it on a picture. any help?