Question 1.6: There are 1,760,000,000,000,000,000,000 molecules of sucrose...
There are 1,760,000,000,000,000,000,000 molecules of sucrose (table sugar) in 1 g. Use scientific notation to express this number with four significant figures.
ANALYSIS Because the number is larger than 1, the exponent will be positive. You will have to move the decimal point 21 places to the left.

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The first four digits—1, 7, 6, and 0—are significant, meaning that only the first of the 19 zeroes is significant. Because we have to move the decimal point 21 places to the left to put it after the first significant digit, the answer is 1.760 \times 10^{21}.
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