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    this is all the info you have and all you need and the ms says

    first mark is for calculation of error.Second mark is for comparison oftemperature error to mass error.Uncertainty in mass =(0.005 x 100 x 2/5.00) = (±)0.2% (1)Uncertainty / error in massmeasurement (much) smaller thanuncertainty in temperature reading (1)Second mark depends on first beingcorrect, but allow second mark if masserror is 0.1% (as 0.005 not doubled)

    also why have they multipled the uncertainity of the 5g nh4cl by 2 the balance is read only once while measuring that mass?
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