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OCR Chemistry A 2016 unofficial mark scheme 27/05/16

OCR Chemistry A 2016 unofficial mark scheme 27/05/16

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Reply 320

username4134224

Original post by X_IDE_sidf

Percentage error of water removed mass: 1.72% again I got 3.57%.

\pm 0.01 \because

two measurements

\frac{0.57-0.55}{0.56}\times 100

It should be 1.72% as there are two measurements, so it should be 2* 0.005/0.58 = 0.0172 =1.72%

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