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What will be the molarity of the solutoin containing 18.25 g of HCl gas in 500 g of water ?

(a) 0.1 m            (b) 1 M           (c) 0.5 m                  (d) 1 m


Solution

(d)

Molarity is defined as the number of moles of solute present in 1 kg of solvent. It is denoted by m.

Thus, Molarity(m)=Moles of soluteMass of solvent (in kg)      ...(i)

Given that, Mass of solvent (H2O)=500 g=0.5 kg

Weight of HCl = 18.25 g

Molecular weight of HCl =1×1+1×35.5=36.5g

Moles of HCl =18.2536.5=0.5

m=0.50.5=1m                   [from Eq. (i)]

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