Question

If the density of ch3oh h s. 793 kg per litre what is its volume needed for making 2.5 litre of its. 25 molar solution

Answer 1

Answer:

molarity = number of mole of solute/volume of solvent in liters

0.25 = number of mole of methanol/2.5

no. of mole of methanol = 0.25×2.5 = 0.625 mole

weight of methanol = no. of mole of methanol×molecular weight of methanol

                            = 0.625×32

                            = 20 gram

weight of methanol = 20/1000 kg

volume = weight of methanol/density

           = (20/1000)/0.793

           = 20/793

           = 0.025liter