Avogadro's Number Is the Number of Molecules of a Substance $6.02 \times 10^{23}, 6.022 \times 10^{23}$

question 54

Multiple Choice

Avogadro's number is the number of molecules of a substance in a quantity of the substance measured in grams equal to its atomic weight. It can only be determined by chemistry or physics experiments. It is named after Amadeo Avogadro, who postulated in 1811 that this number was the same for all substances. Various values for this constant have been determined experimentally. Some of them are $6.02 \times 10^{23}, 6.022 \times 10^{23}$ , and $6.02214199 \times$ $10^{23}$ . The $10^{23}$ means that you have to move the decimal point 23 places to the right. Which of these values is the most accurate?

• A) \( 6.02 \times 10^{23} \)
• B) \( 6.022 \times 10^{23} \)
• C) \( 6.02214199 \times 10^{23} \)
• D) We can't tell.

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