Question

Calculate the molarity of each aqueous solution:

Answer 1

Molarity of aqueous solution is 1.9 M

The molarity in given case can be calculated by the formula -

M = number of moles/Volume of solution in liters

Number of moles is further calculated by the formula -

Number of moles = mass/molar mass

As we know, molar mass of ethanol is 46 g/mol

Keep the values in formula to calculate number of moles.

Number of moles = $\frac{0.82}{46}$

Number of moles = 0.02

As we know, 1000 ml = 1l

So, 10.5 ml = 0.0105 l

Keep the values in formula of molarity to calculate the molarity -

Molarity = $\frac{0.02 }{0.0105}$

Molarity = 1.9 M

Hence, the molarity of given aqueous solution is 1.9 M.

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