if the density of methanol is 0.793 kg/l, what is its volume needed for making 2.5l of its 2.5 M solution?

Molar mass of methanol = 32 g mol–1
= 0.032 kg mol–1 (converting to Kg)
Molarity of methanol solution=0.793 Kg L-1/ 0.032 Kg mol -1
= 24.78 mol L–1

No. of moles required = M x V = 2.5 x 2.5 = 6.25 mol Now, moles = wt. / molar mass Therefore, wt. taken = 6.25 x 32 gm = 200 gm = 0.2 kg Using volume = mass / density, Vol= 0.2 / 0.793 = 0.2522 L = 252.2 mL