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38 An aluminum sample has a mass of 80.01 g and a density of 2.70 g/cm3. According to the data, to what number of significant figures should the calculated volume of the aluminum sample be expressed?(1) 1 (3) 3
(2) 2 (4) 4
The answer is (3) 3. The calculation rule of significant figures is when multiplication and division, the significant figures of result is equal to the least of the numbers involved. The significant figure of 2.70 and 80.01 is 3 and 4.
To determine the number of significant figures use this memory aid: If the decimal is Absent count from the Atlantic (right side). If the decimal is Present count from the Pacific (left side). Start counting at the first non-zero digit.
The result of a calculation can only contain the lowest number of significant figures given in the problem. 2.70 has 3 significant figures.
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