What will be the molality of the solutio...

What will be the molality of the solution containing 18.25 g of HCl gas in 500 g of water?

A

0.1m

B

1M

C

0.5m

D

1m

Text Solution

Verified by Experts

The correct Answer is:

D

Molality is defined as the number of moles of solute present in 1 kg of solvent, it is denoted by m.
Thus, ` "Molality" (m)=("Moles of solute")/("Mass of solvent"(inkg)) `
Given that, Mass of solvent `(H_(2)O)=500g=0.5kg`
Weight of `HCl=18.25g`
Molecular weight of `HCl=1xx1+1xx35.5=36.5g`
Moles of `HCl=(18.25)/(36.5)=0.5`
`m=(0.5)/(0.5)=1m`

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Knowledge Check

What will be the molality of the solution made by dissolving 10 g of NaOH in 100g of water ?

A

2.5 m

B

5 m

C

10 m

D

1.25 m

What will be the molarity of a solution which contains 5.85 g of NaCl (s) per 500 mL of the solution ?

A

`"4 mol L"^(-1)`

B

`"20 mol L"^(-1)`

C

`"0.2 mol L"^(-1)`

D

`"2 mol L"^(-1)`

What is the molarity of a solution containing 10 g of NaOH in 500 mL of solution ?

A

`"0.25 mol L"^(-1)`

B

`"0.75 mol L"^(-1)`

C

`"0.5 mol L"^(-1)`

D

`"1.25 mol L"^(-1)`

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