Chemistry

An Ap student got a lab report back with "-4.5 % error" written in red on it. He had found the boiling point of an unknown liquid to be 45 C. What is the correct boiling point of his unknown liquid?

I know first I would write -4.5 % error = |4.5-x|/x x 100 but I don't know what to do after that.

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  1. I would do
    [(45-x)/x]*100 = -4.5
    45-x/x = -0.045
    45-x = -0.045x
    45 = x-0.045x
    45 = 0.955x
    x = 47.12

    check:
    [(45-47.12)/47.12]*100 =
    [-2.12/47.12]*100 = 44.99
    I may have used too many significant figures but you get the idea.

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