What volume of a 1.00 m stock solution of glucose must be used to make 500.0 ml of a 1.75 ✕ 10–2 m glucose solution in water? (a) 1.75 ml, (b) 8.75 ml, (c) 48.6 ml, (d) 57.1 ml, (e) 28,570 ml?

Answer : The correct option is, (b) 8.75 ml

Solution :

According to the dilution law,

where,

= molarity of stock solution = 1.00 M

= volume of stock solution = ?

= molarity of glucose solution =

= volume of glucose solution = 500 ml

Now put all the given values in the above law, we get the volume of stock solution.

Therefore, the volume of 1.00 M stock solution required volume is, 8.75 ml

a gas, having a molecular weight of 13 kg/kmol and a kinematic viscosity of 0.25 cm2/s, flows through a pipe 0.25 m internal diameter and 5 km long at the rate of 0.4 m3/s and is delivered at atmospheric pressure.