alleryStart learning →A 355 mL soft drink sample contains 0.133 mol of sucrose. What is the molar concentration of sucrose?
A0.375 M
B2.67 M
C0.0375 M
D47.2 M
Answer & Solution
Correct answer: A. 0.375 M
1. Molarity is moles of solute divided by litres of solution.
2. Convert the volume first: 355 mL x 1 L / 1000 mL = 0.355 L.
3. Divide the amount by the volume: 0.133 mol / 0.355 L.
4. The concentration is 0.375 M.
5. The value 0.375 becomes 0.0375 M if the volume is left in millilitres, so the unit conversion is the step to guard.
_Source: OpenStax Chemistry (CC BY 4.0), Ch 3 "Composition of Substances and Solutions", section 3.3 Molarity_
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