Which of the following represents 0.007462 rounded to two significant figures?

0.0075 or 7.5x10⁻³

Explanation:

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In this case, when rounding to two significant figures a number that is less than 1, we take into account that the left-handed zeros, prior to the first nonzero digit are not significant, for 0.007462, two significant figures include the 7 and the 4; however, that 4 is rounded up to 5 since there is a 6 after it, and therefore, the correct representation would be either of the following ones:

0.0075

7.5x10⁻³

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the atomic mass is the bottom number on the element.

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