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QUESTION 2 The number of water molecules in 2.3 mg of water is O 6.02 x 1023 O 77.0 x 1023 O 7.7 x 1023 O 7.7 x 1019 O none of the above

QUESTION 2 The number of water molecules in 2.3 mg of water is O 6.02 x 1023 O 77.0 x 1023 O 7.7 x 1023 O 7.7 x 1019 O none of the above

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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**Question 2** The number of water molecules in 2.3 mg of water is: - ○ 6.02 × 10²³ - ○ 77.0 × 10²³ - ○ 7.7 × 10²³ - ○ 7.7 × 10¹⁹ - ○ none of the above **Explanation:** To find the number of water molecules in a given mass of water, follow these steps: 1. **Calculate the number of moles**: - Water (H₂O) has a molar mass of approximately 18.015 g/mol. - Convert 2.3 mg to grams: 2.3 mg = 0.0023 g. - Moles of water = (0.0023 g) / (18.015 g/mol) = 0.0001276 mol. 2. **Use Avogadro’s number**: - Avogadro’s number is 6.02 × 10²³ molecules/mol. - Number of molecules = 0.0001276 mol × 6.02 × 10²³ molecules/mol ≈ 7.68 × 10¹⁹. In this case, the closest answer should be 7.7 × 10¹⁹ molecules.
Transcribed Image Text:**Question 2** The number of water molecules in 2.3 mg of water is: - ○ 6.02 × 10²³ - ○ 77.0 × 10²³ - ○ 7.7 × 10²³ - ○ 7.7 × 10¹⁹ - ○ none of the above **Explanation:** To find the number of water molecules in a given mass of water, follow these steps: 1. **Calculate the number of moles**: - Water (H₂O) has a molar mass of approximately 18.015 g/mol. - Convert 2.3 mg to grams: 2.3 mg = 0.0023 g. - Moles of water = (0.0023 g) / (18.015 g/mol) = 0.0001276 mol. 2. **Use Avogadro’s number**: - Avogadro’s number is 6.02 × 10²³ molecules/mol. - Number of molecules = 0.0001276 mol × 6.02 × 10²³ molecules/mol ≈ 7.68 × 10¹⁹. In this case, the closest answer should be 7.7 × 10¹⁹ molecules.
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