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Question from: Chemistry

What is the concentration of a solution containing 2g of NaOH in 100 cm3 of solution? [Na = 23, O = 16, H = 1]

A)  

0.30 mol dm−3

B)  

0.50 mol dm−3

C)  

0.40 mol dm−3

D)  

0.05 mol dm−3

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j

juanbacan

hace 18 días

Solution

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Step-by-step:

  • Molar mass of NaOH = 23 + 16 + 1 = 40 g mol−1.
  • Moles of NaOH = \( \dfrac{2}{40} = 0.05 \) mol.
  • Volume = 100 cm3 = 0.100 dm3.
  • Concentration \(c = \dfrac{n}{V} = \dfrac{0.05}{0.100} = 0.50\) mol dm−3.

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