Question:
The mass of a mixture containing NaCl and NaBr is 4.0 g. If Na is 20% of the total mixture, the composition of NaCl in the mixture is
The mass of a mixture containing NaCl and NaBr is 4.0 g. If Na is 20% of the total mixture, the composition of NaCl in the mixture is
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To calculate the composition of a component in a mixture, find the mass of the component and divide it by the total mass of the mixture. Multiply by 100 for percentage.
Updated On: Jun 6, 2025
- 48%
- 55%
- 45%
- 52%
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The Correct Option is A
Solution and Explanation
First, calculate the mass of Na in the mixture, which is 20% of 4.0 g, i.e., 0.8 g of Na.
Then, use the molar masses of NaCl and NaBr to calculate the fraction of Na that is in NaCl.
By setting up the equation for the mass of NaCl, you will find that NaCl constitutes 48% of the mixture.
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