A solution contains 0.0653g of compound in 8.31g of ethanol. The molarity of the solution is 0.0368m. Calculate the molecular weight of the compound
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Chemisty - drbob222, Thursday, February 7, 2008 at 9:40pm
The molarity of the solution can't be 0.0368 m. It can be 0.0368 molar or it can be 0.0368 molal. Which is it.
I think you MUST have meant molality.
molality = mols/kg solvent
0.0368 m = mols/0.00831 kg.
Solve for mols = 0.0368 x 0.00831
mols = g/molar mass
You know mols and g, solve for molar mass.
so i got 0.0368 x 0.00831 = 3.06 x 10^-4
and the molar mass of ethanol is 46 grams
so can some one help me in where to plug these in right please
3.06 10^-4 is correct for the mols.
mols = g/molar mass.
You know mols and you know grams. Solve for molar mass of the unknown compound. (Ethanol is the solvent, not the unknown.
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To calculate the molecular weight of the compound, you need to use the formula:
Molecular weight = mass of the compound / number of moles of the compound
From the given information, you have the molarity of the solution and the mass of the compound. Follow these steps to calculate the molecular weight:
1. Calculate the number of moles of the compound:
- molality = mols/kg solvent
- 0.0368 molality = mols/0.00831 kg
- Solve for mols: mols = 0.0368 x 0.00831
- mols = 0.000305688 moles (approximately)
2. Use the molar mass formula to find the molecular weight:
- mols = mass of compound / molar mass
- Rearrange the formula to solve for the molar mass: molar mass = mass of compound / mols
- Substitute the known values: molar mass = 0.0653 g / 0.000305688 moles
3. Calculate the molar mass:
- molar mass = 213.546 g/mole (approximately)
Therefore, the molecular weight of the compound is approximately 213.546 g/mole.
To calculate the molecular weight of the compound, you need to use the given information about the molarity and mass.
- First, calculate the number of moles of compound using the molality (not molarity) equation: molality = mols/kg solvent. In this case, the molality is 0.0368 m and the mass of the solvent (ethanol) is 8.31 g. So, molality = mols/0.00831 kg.
- Rearrange the equation to solve for moles: mols = molality × kg solvent. Plug in the values: moles = 0.0368 × 0.00831.
- Next, you need to determine the molar mass of the compound. The molar mass is given by the equation: mols = g/molar mass of compound. Rearrange the equation to solve for molar mass of the compound: molar mass of compound = g/mols.
- Plug in the values you found above: molar mass of compound = 0.0653 g / (0.0368 × 0.00831).
- Calculate the value to find the molecular weight of the compound: molar mass of compound = 0.0653 / (0.0368 × 0.00831) = 228.9 g/mol.
Therefore, the molecular weight of the compound is 228.9 g/mol.