Math, asked by 9552688731, 1 year ago

If the density of methanol is 0.793kg/L , what is it's volume needed for making 2.5L of its 0.25 M solution ?

Answers

Answered by Darpan82

Molar mass of methanol (CH3OH) = (1×12)+(4×1)+(1×16) = 32 g mol-1 = 0.032 kg mol-1
Molarity of the solution = 0.793/0.032 = 24.78 mol L-1

Applying, M1V1 (Given Solution) = M2V2 (Solution to be prepared)
24.78×V1 = 0.25×2.5 L
V1= 0.02522 L = 25.22 mL

9552688731: Molarity = number of moles of solute/volume of the solution // please tell me how do you take values?

9552688731: your answer is right but tell me how do you take molarity = 0.793/0.032

Darpan82: If we let x g
be the mass, then, 0.25 = (x/32) X (1/2.5) = 0.02 Kg
, density = M/ V, the density of methanol is 0.793 KgL-1.

Therefore, Volume = Mass/ Density = 0.02/0.793 = 0.025 Litres

Darpan82: I directly put the value in the formula

Darpan82: I hope that u understood

9552688731: ok i understood thank you

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