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ur class fella
Questions (1)
Hi,
Can any1 help with theses questions. I need to solve these because there will be similar questions on the midterm for me,
4 answers
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Answers (9)
oh my God ...how did you guys do at the mid-term.. lol i beat the class average by 15% which is great, I guess
and forgot to mention, I need a volume of 625mL of pH of 11.65....differnt from the original question posted....
Ok here is my solution to it but i am constantly told that it is wrong. d=0.97g/mL Mass %= 6.8% 1000mL= 1L d=m/v m=d X v m= 0.97g/mL X 1000mL m=970g mNH3 = 970g X 0.068=65.96g of NH3 MM of NH3 = 14g/mol + 3 X 1g/mol=17g/mol nNH3 = 65.96g/17g/mol n=3.88mol
ok, here is the thing. I have tried other questions and got the right answer :P But for question # 2 I convert the ph to pOH and den find the OH- den I find the # of moles from 6.8% ammonia and den I use the Kb value of ammonia to find the OH- in the 6.8%
But these questions were never taught in the class and they are appearing on the mid-term.
yeah it should be around or less den 2. i mean the i should be = 2 because it breaks into to ions for KCL and i am getting 1.6. pretty close eh.
holy, we CHMA11 kids are all over the internet. trying to find how to work out the pre-labs and mastering chemistry homework.
some 1 help it is due 9 am tomorrow. for the chart the solubility curves at kno3 in any general chemistry text book.
lolz, you must a chma11 student at utsc. you are doing a great job for other 799 kids taking this course. keep it up. lol me stuck on the same question.
