Isoamyl salicylate (м = 208.25 g/mol) has a pleasant aroma and is used in perfumes and soaps. Which of the following combinations gives a 0.75 m solution of isoamyl salicylate in ethyl alcohol (d = 0.7893 g/mL)
What are the combinations?
To determine how to prepare a 0.75 m (molar) solution of isoamyl salicylate in ethyl alcohol, you need to understand the relationship between molarity, mass, and volume.
Molarity (M) is defined as the number of moles of solute (in this case, isoamyl salicylate) divided by the volume of the solution in liters.
To find the number of moles of isoamyl salicylate required for a 0.75 m solution, you can use the following equation:
Molarity (M) = moles of solute / volume of solution (in liters)
Rearranging the equation, we have:
moles of solute = Molarity (M) * volume of solution (in liters)
Since we want to prepare a 0.75 m solution of isoamyl salicylate, we need to find the number of moles required.
First, convert the volume of solution to liters:
1 mL = 0.001 L
Next, calculate the number of moles using the formula:
moles of solute = Molarity (M) * volume of solution (in liters)
moles of solute = 0.75 mol/L * volume of solution (in liters)
Now, we need to find the mass of isoamyl salicylate required to achieve the desired moles of solute. The mass can be calculated using the molar mass of isoamyl salicylate (м = 208.25 g/mol) and the following equation:
mass = moles of solute * molar mass
Substituting the values:
mass = moles of solute * 208.25 g/mol
mass = (0.75 mol/L * volume of solution) * 208.25 g/mol
To prepare a 0.75 m solution, you will need to use a combination that adds up to the calculated mass of isoamyl salicylate.
Without the given options, it's not possible to suggest a specific combination. However, you need to choose a combination that adds up to the calculated mass (in grams) of isoamyl salicylate in the ethyl alcohol.
Make sure to check the units and convert where necessary (for example, from mL to L and vice versa) to match the units used in the calculations.
Please provide the available options so I can help you choose the correct combination.