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Stoichiometry

Write down th...

Question

Write down the concentration of 2g NaOH in 50ml solution in g/L and mol/L.

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Solution

Mass of NaOH = 2 grams
Molar mass of NaOH = 40 grams
Volume of solution = 50 ml = 0.05 L
Number of moles of NaOH in 2 grams of NaOH
= $\frac{2}{40} = 0.05 m o l e s$ Concentration in g/ml = $\frac{2}{0.05} = 40 g / L$
Concentration in mol/L = $\frac{0.05}{0.05} = 1 m o l / L$

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