45 propare4. (2.5 points) You are preparing a chloroform (CH3Cl) solution in 2-propanol. Calculate the following. Remember to show your work.Cl7Cllnlnln3H8a. How many moles of chloroform do are present in 56.0cg of a pure liquid?Imolesb. If the chloroform is dissolved in 2-propanol for a final volume of 100mL, what is the molar concentration?c. If the solution is diluted to 100μM, what is the final volume of the solution?
Q. 45 propare4. (2.5 points) You are preparing a chloroform (CH3Cl) solution in 2-propanol. Calculate the following. Remember to show your work.Cl7Cllnlnln3H8a. How many moles of chloroform do are present in 56.0cg of a pure liquid?Imolesb. If the chloroform is dissolved in 2-propanol for a final volume of 100mL, what is the molar concentration?c. If the solution is diluted to 100μM, what is the final volume of the solution?
Convert to grams: Step 1: Convert the mass of chloroform from centigrams to grams. 56.0cg=0.56g
Calculate moles: Step 2: Calculate the moles of chloroform using its molar mass.Molar mass of chloroform CHCl3 = 12.01 (C) + 1.01 (H) + 3×35.45 (Cl) = 119.37 g/molMoles of chloroform = 0.56 g / 119.37 g/mol = 0.00469 moles
Molar concentration: Step 3: Calculate the molar concentration of the solution.Total volume = 100mL=0.1LMolar concentration = 0.1L0.00469moles=0.0469M
Calculate final volume: Step 4: Calculate the final volume of the solution when diluted to 100μM.100μM=0.0001MUsing the dilution formula C1V1=C2V2, where C1=0.0469M, V1=0.1L, C2=0.0001MV2=(0.0469M×0.1L)/0.0001M=46.9L
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