alleryStart learning →Liquid bleach is 7.4% sodium hypochlorite by mass. What mass of NaOCl is in a 250.0 g bottle of the bleach?
A7.4 g
B18.5 g
C74 g
D1.85 g
Answer & Solution
Correct answer: B. 18.5 g
1. A mass percentage of 7.4 means 7.4 g of NaOCl in every 100 g of bleach.
2. Scale to the bottle: 250.0 g x 7.4 / 100.
3. That gives 18.5 g of sodium hypochlorite.
4. Answering 7.4 g forgets to scale past the 100 g reference sample.
_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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