Tuesday
October 21, 2014

Posts by Tichele


Total # Posts: 15

College Chemistry
Ok, so I’m working on this problem where I have to get electron per mole. I know that I need to get from Coulombs/mole of H2 all the way to # of electrons/ moles of electrons. I know that the half life reaction is as follows: 2H+ +2e- -->H2(g) For Coulombs per mole of ...
May 2, 2011

Chemistry College Level
36.85 mL of a KMnO4 solution when acidified reacted with 1.076g of Mohr's salt, Fe(NH4)2(SO4)2 x 6H2O What is the normality of the KMnO4 solution? How do I set this up? I can't figure it out at all...
April 17, 2011

Chemistry College Level
Ok, I see.
April 17, 2011

Chemistry College Level
Ok, so here's my question: If exactly 14.563 grams of KMnO4 were dissolved to yield 750 mL of solution waht would be the normality of the KMnO4? From a previous question (that this question says to refer to) we have: MnO4- +8H+ +5e --> Mn2+ +4H2O I'm not exactly ...
April 17, 2011

chemistry lab (college level)
I see. Thanks so much for your help!
April 9, 2011

chemistry lab (college level)
So, this is going to be more like 2 or 3 questions. Here goes. First, what is the net-ionic reaction for Fe (III) + K4Fe(CN)6 be? I've been agonizing over this for HOURS with no answer in sight. (I don't even know what to put down as a product!) Second, what would the ...
April 9, 2011

College Chemistry
2.50 mL of ethyl acetate and 2.50 mL of distilled water are added to the 5.00 mL of 3 Molar HCl and the mixture is allowed to sit for a week. At the end of this time, 28.30 mL of 1.000 Molar NaOH was needed to titrate the solution. (The HCl was the same as used in 1a. This ...
February 20, 2011

Chemistry
Thank you so much! I was really stuck and my brain went completely blank.
January 19, 2011

Chemistry
In an experiment, 238 mL of 0.45 molar hydrochloric acid completely reacts with excess iron to produce hydrogen gas and iron (III) chloride. What volume will the hydrogen gas occupy if it is collected over water at 35 degrees Celsius and 735 torr? The vapor pressure of water ...
January 19, 2011

Chemistry
Ok, so I've worked out the problem but I'm getting something like 6.6 x 10^-4 percent. That can't be right, can it? Here's my work: NaHCO3(s) + HCl(aq) ---> NaCl(aq) + CO2(g) + H2O(l) Pressure of the gas= pressure of atmosphere - pressure of 23.0 degrees ...
December 11, 2010

Chemistry
This might be a stupid question, but why do I convert to moles of CO2 first?
December 11, 2010

Chemistry
A 3.23 gram sample of a sodium bicarbonate mixture was reacted with excess acid. 48.52 mL of the evolved gas was collected over water at 0.930 arm and 23.0 degrees Celsius. What is the percentage of sodium bicarbonate in the original mixture? The pressure of water at 23.0 ...
December 11, 2010

Chemistry
Ok, so I'm stuck....Here is my work thus far (please see my previous response for the values of fusion and vaporization, as well as the specific heats) q=m x specific heat x change in temp =20.0 g x (2.o92 J/g x Kelvin) x (0--5)=209.2 J So... 50,000 J - 209.2 J= 49790.8 J ...
December 11, 2010

Chemistry
All right. I'll go try and work on this problem and come back if I need some help. The specific heat of ice: 2.092 J/g-Kelvin The specific heat of water: 4.184 J/g-Kelvin The specific heat of steam: 1.841 J/g-Kelvin Heat of Fusion: 6.008 kJ/mol at 0.00 degrees Celsius Heat...
December 11, 2010

Chemistry
If 50.0 kJ of heat are added to a 20.0 gram ice cube at -5.00 degrees Celsius, what will be the resulting state and temperature of the water? I need some serious help with this! I think I'm making it much harder than it really has to be.
December 11, 2010

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