Q31 How many moles are present in 20 cm^3solution of 0.05M HCL?
Ans 10^-3mol
To find the number of moles present in a solution, you need to know the volume of the solution and the molarity of the solute. In this case:
Given:
Volume of the solution (V) = 20 cm^3
Molarity of HCl (M) = 0.05 M
To find the moles, you can use the formula:
moles = volume (in liters) x molarity
First, convert the volume from cm^3 to liters:
20 cm^3 = 20/1000 = 0.02 liters
Now, plug in the values in the formula:
moles = 0.02 liters x 0.05 M
moles = 0.001 mol = 10^-3 mol
Therefore, there are 10^-3 moles or 0.001 moles of HCl present in the 20 cm^3 solution.