How to Find Molar Mass: A Complete Explanation
How to find the molar mass of a substance?
In your specific case, with the given data, how can you calculate the molar mass?
Final Answer:
The molar mass is the mass of one mole of a substance and is expressed in grams per mole (g/mol). To find the molar mass, you need to know the mass of the substance and the number of moles. In this case, the given information does not include the number of moles, so we cannot calculate the molar mass with the given information.
Explanation:
To find the molar mass of a substance, you need to know the mass of the substance and the number of moles. The molar mass is the mass of one mole of a substance and is expressed in grams per mole (g/mol).
In this case, you are given the volume of cyclohexane (20.0 mL) and its mass (15.6 g or 0.0156 kg). To find the molar mass, we need to convert the mass of cyclohexane to moles using its density and then divide the mass by the number of moles.
First, we need to convert the volume of cyclohexane to grams. The density of cyclohexane is given as 0.779 g/mL. So, 20.0 mL of cyclohexane would have a mass of 15.6 g.
Next, we need to convert the mass from grams to kilograms:
15.6 g x 1 kg/1000 g = 0.0156 kg
Now, to calculate the molar mass, we need to know the number of moles. Unfortunately, the data provided does not give us the number of moles, so we cannot determine the molar mass in this case.
Detail Explanation:
Molar mass is calculated using the formula: Molar mass = Mass (in grams) / Number of moles. The number of moles for a substance is often found from the host compound's known freezing-point depression data. If one has the number of moles, they only need to input into the formula to find the molar mass.
To find the molar mass of a substance, one uses the formula: Molar mass = Mass (in grams) / Number of moles. A mole is a unit of measure in chemistry that determines the amount of a chemical substance that contains as many units as there are atoms in exactly 12 grams of pure carbon-12.
In your specific case, you have the mass of cyclohexane as 15.6 g. Now, the number of moles is needed. This is usually computed differently, involving the known freezing-point depression of cyclohexane and the change in freezing point when a solute is added. This isn't straightforward without that specific information.