Hi, this is my first lab in 2nd semester of chemistry, and im not sure about my answers in the assignment can someone give it a quick look to check them?
this is my phase diagram:
tinypic. com/view.php?pic=1605yev&s=7
p.s. ignore the lone red dot its supposed to be 38C..
there were the questions:
Mass of lauric acid (from balance): 1.00 g
melting point of lauric acid (from excell): 42.5C
mass of benzoic acid (from balance): 0.246g
melting point of lauric acid/benzoic acid mixture: 34.0C
^Tf= (3.9 C/m)(0.246g/mol) / 0.001 = 959.4
Molecular mass of benzoic acid from calculations: 0.9594/0.0085=112.9
molecular mass of benzoic acid: (given by teacher) 122.2g/mol
%error= 959.4-122.12 / 122.12 X 100 = 690%
Im not sure about the percent error if i used the right numbers. can someone please help? i want to get a good grade on this assignment and its due Wednesday...
If i could just know if the percent error is correct that would be great, that's the one im most unsure of..
I looked only at the percent error. That should be[(112-122)/122] *100 = much better than 690%
lol, i thought the percent error was too high!
To calculate percent error, you need to compare your experimental value to the accepted or known value. In this case, the experimental value is 959.4 and the accepted value is 122.2.
To calculate the percent error, use the formula:
%error = (|experimental value - accepted value| / accepted value) x 100
Plugging in the values, you get:
%error = (|959.4 - 122.2| / 122.2) x 100
%error = (837.2 / 122.2) x 100
%error ≈ 684.6%
So, the percent error you calculated is approximately 684.6%.