Example Exercise 9.1 Atomic Mass and Avogadro’s Number

What is the number of molecules in 1.00 mol of any gas? Answer: See Appendix G. Concept Exercise. We apply the unit factor 6.02 . ×. 10. 23. atoms Na/1 mol Na to cancel moles , which appears in the denominator. The answer is rounded to three digits because the given value and unit factor each have three significant digits. ................
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