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What is the molar concentration of a solution with 40 gram of NaOH in 1 liter solution?

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What is the molar concentration of a solution with 40 gram of NaOH in 1 liter solution?

(a) 1 mole/liter

(b) 2 mole/liter

(c) 3 mole/liter

(d) 4 mole/liter

I have been asked this question by my college director while I was bunking the class.

I'd like to ask this question from Concentration in chapter Moles, Density & Concentration of Basic Chemical Engineering

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Right choice is (a) 1 mole/liter

To explain: Molar concentration = (40/40)/1 = 1 mole/liter.

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