Calculate the volume of a 1.25 M solution of HCN made from 0.31 moles of HCN.
To calculate the volume of the solution, we first need to determine the amount of solvent (water) needed to dissolve 0.31 moles of HCN to make a 1.25 M solution.
1. Calculate the mass of HCN:
Molar mass of HCN = 1(1.01) + 12.01 + 14.01 = 27.03 g/mol
Mass of 0.31 moles of HCN = 0.31 mol * 27.03 g/mol = 8.37 g
2. Using the formula for molarity:
Molarity = moles of solute / volume of solution in liters
1.25 M = 0.31 moles / volume of solution in liters
Volume of solution in liters = 0.31 moles / 1.25 M = 0.248 L
3. Convert volume to milliliters:
0.248 L * 1000 mL/L = 248 mL
Therefore, the volume of the 1.25 M solution of HCN made from 0.31 moles of HCN is 248 mL.