What is the percentage by mass of chlorine in sodium chloride (NaCl)?

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Prepare for the WJEC GCSE Chemistry Exam with multiple choice questions and detailed explanations. Enhance your knowledge and boost your confidence. Get exam-ready today!

Multiple Choice

What is the percentage by mass of chlorine in sodium chloride (NaCl)?

Explanation:
To find the percentage by mass of chlorine in sodium chloride, compare how much mass comes from chlorine to the total mass of the compound. Sodium chloride has one sodium atom (about 23) and one chlorine atom (about 35.5), so its molar mass is 23 + 35.5 ≈ 58.5 g per mole. The chlorine portion is 35.5 g per mole. The mass percentage is (35.5 / 58.5) × 100 ≈ 60.68%, which rounds to 60.7%. So chlorine makes up about 60.7% of NaCl.

To find the percentage by mass of chlorine in sodium chloride, compare how much mass comes from chlorine to the total mass of the compound. Sodium chloride has one sodium atom (about 23) and one chlorine atom (about 35.5), so its molar mass is 23 + 35.5 ≈ 58.5 g per mole. The chlorine portion is 35.5 g per mole. The mass percentage is (35.5 / 58.5) × 100 ≈ 60.68%, which rounds to 60.7%. So chlorine makes up about 60.7% of NaCl.

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