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प्रश्न
Write down the concentration of the following solution in g/L and mol/L.
2 g NaOH in 50 ml solution
संख्यात्मक
उत्तर
Given:
Weight in grams = 2g
Volume in litres = 50 mL = 0.05L (1 mL = 1/1000L)
Molecular mass of NaOH = 23 + 16 + 1 = 40 g/mol
Concentration in `"g"/"L" = (2"g")/(0.5"L")`
Concentration in = 40 g/L
No. of Moles(n) = `"weight"/"molecular mas"`
= `(2"g")/(40 "g/mol")`
= 0.05 mol
Concentration in `"mol"/"L" = "no. of mole"/"Volume in L"`
Concentration in `"mol"/"L" = (0.05 "mole")/(0.05 "L")`
Concentration in mol/L = 1mol/L
Thus, Concentration in g/L is 40g/L and Concentration in mol/L is 1mol/L.
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