Thursday
May 23, 2013

# Posts by Chem

Total # Posts: 104

gen chem
E cell is not given, just the E0 cell which is -1.133V

gen chem
what is the pK (=-logK)at 25C for the reaction below? Cl2(g)+6H2O(l)+5Cu2+(aq)<-->2ClO3-(aq)+12H+(aq)+5Cu(s) E0=-1.133V

gen chem
if the voltage of the cell is 2.0898V at 25C when [Mg2+] = 0.1945M and the pressure of H2 = 1.00atm, what is the pH? E0=2.3700V Mg(s)+2H+(aq)<--> Mg2+(aq)+ H2(g)

gen chem
what must be the current in amperes to plate out 7.437g of Al from am aqueous solution of Al3+ in 5.4x10^2 minutes?

General Chemistry
How much energy in kJ is realeased to form one mole of Cd 116(isotope) from protons and neutrons if the atom has a mass of 115.90476amu.

Molarity/molality
Ohhhhh That makes so much more sense. I didn't fully understand what the problem was asking. Thank you so very much =)

Molarity/molality
In regards to your latest post, I meant the very first step, not the step you did to check the answer. I'm assuming the first line is a typo?

Molarity/molality
And I'm a little unsure as to why after you find the mass of the solution 1059.269 you find how many g of H20 are in 1000 g of that soln. Why can't we just use the 1058.269 g? Was it to get the perfect 1000g (1kg) or was that unnecessary?

Molarity/molality
This makes more sense, but your first step is a little confusing. when I do 26.70 x 18.015 g H2O/mol I get 481.005 but when I do: 3.29 m x 18.015 g H2O/mol then I get your ans: 50.269 g H20

Molarity/molality
Thank you! I got the correct answer.

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