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February 28, 2015

February 28, 2015

Posted by **bun** on Monday, January 18, 2010 at 4:23pm.

[6.2( +_ 0.2) - 4.1(+_ 0.1)] : 9.43(+_0.05)

find absolut uncertainty and relative uncertainty.

PLEASE HELP:I solved them and got the exact absolute uncertainty like the answer key, but I didn't get right answer of relative unsertainty, my answer for both case 9.5 %, but the answer key is 11% for both , why?

this is my solution :

for problem 1:

relative uncertainty = [sqr(0.2^2 + 0.1^2)/2.1] *100 am I wrong?

Please help, thank you in advance.

- chemistry -
**bobpursley**, Monday, January 18, 2010 at 5:52pmYou calculated wrong.

relatuncert= sqrt(.04+.01)/2.1=sqrt(.05)/2.1= .106 rouned to two sig figures will be 11 percent.

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