Calculate the molarity of solution which is made up of $4 g m N a O H$ in $500 m l$ of water.

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Solution

Molarity = Number of moles / Amount of solution ( In liters)
NaOH molar mass = 23 + 16 + 1 = 40 g
=> Number of moles in 4 g = 4 g / 40 g = 0.1 mole
Amount of water = 0.5 liters
Molarity = 0.1 Mole / 0.5 Litres
=> Molarity = 0.2 M

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