Question

4 g of sodium hydroxide are dissolved in 200 ml of water. Find the molarity of Solution​

Answer 1

Explanation:

NaOH has a molar mass of 40g/mol . So now, we need to convert 100mL into L . Since we have now the desired units, we plug them into the equation. So, the molarity of the solution will be 1M

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Answer 2

Given mass = 4 g

Molar mass of NaOH = 23 + 16 + 1 = 40 g/mol

No. of moles = Given mass / Molar mass = 4 /40 = 0.1 moles

Volume = 200 mL

In L , 200 / 1000 = 0.2 L

Molarity = No. of moles / Volume (in L)

= 0.1 / 0.2 = 0.5 mol/L

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