alleryStart learning →A bleach bottle is labelled 7.4% sodium hypochlorite by mass. How much NaOCl is in a 100.0 g sample?
A74 g of NaOCl
B0.74 g of NaOCl
C7.4 g of NaOCl
D0.074 g of NaOCl
Answer & Solution
Correct answer: C. 7.4 g of NaOCl
1. A mass percentage of 7.4 percent means 7.4 g of solute in every 100 g of solution.
2. The sample here is 100.0 g of bleach.
3. It therefore contains 7.4 g of sodium hypochlorite.
4. Percentages read directly off a 100 g basis, which is what makes that sample size convenient.
_Source: OpenStax Chemistry (CC BY 4.0), Ch 3 "Composition of Substances and Solutions", section 3.4 Other Units for Solution Concentrations_
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