Chemistry · Different methods for expressing the concentration of solution: molality, molarity, mole fraction, percentage (by volume and mass both)
of is dissolved in water and the solution is made to 250 cc. What will be the mo
\( 4.28 \mathrm{g} \) of \( \mathrm{NaOH} \) is dissolved in water and the solution is made to 250 cc. What will be the molarity of the solution?
- A. 0.615 mol \( L^{-1} \)
- B. 0.428 mol \( L^{-1} \)
- C. 0.99 mol \( L^{-1} \)
- D. 0.301 mol \( L^{-1} \)
Step-by-step solution
Molar mass of NaOH is 40 g/mol. Moles of NaOH = 4.28 g / 40 g/mol = 0.107 mol. Volume = 250 cc = 0.250 L. Molarity = moles/volume = 0.107 mol / 0.250 L = 0.428 mol/L.
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