Two samples were weighed using different balance and the following data were obtained. Sample #1=3.719 grams Sample #2=0.42 gram The total mass of the samples should be reported as :
4 grams
4.139 grams
4.140 grams
4.14 grams
4.1 grams
A
4.139 grams
B
4 grams
C
4.1 grams
D
4.14 grams
E
4.140 grams
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Solution
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The correct option is D 4.14 grams After rounding off to 2 significant digits, weight of sample 1 can be reported as 3.72 grams. Therefore, total mass =(3.72+0.42)=4.14 grams.
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