Respuesta :
Answer:
0.0386
Explanation:
To make a solution, we need a certain amount of the solute to be dissolved in the solvent. The solvent is the carrier medium usually water in traditional wet chemistry.
Now, in this particular question, it should be known that methyl alcohol is the solute, while water is the solvent.
We need to calculate the mole fraction of the solute as asked by the question. Now what we do is to find the number of moles of each, add together, then divide the number of moles of methyl alcohol by the sum of the moles of both.
Firstly, we calculate the number of moles of methyl alcohol present. This is mathematically equal to dividing mass by molar mass
Molar mass of methyl alcohol (CH3OH) is 12 + 4(1) + 16 = 32g/mol
The number of moles is thus 1.2/32 = 0.0375 moles
Now, we calculate the number of moles of water. The molar mass of water is 18g/mol
The number of moles of water is thus 16.8/18 = 0.93333
The mole fraction of the solute is thus:
0.0375/(0.0375 + 0.9333) = 0.0386
Answer:
The mole fraction of the solute, methyl alcohol, is 0.0387
Explanation:
Step 1: Data given
Mass of methyl alcohol = 1.20 grams
Molar mass of methyl alchol = 32.04 g/mol
Mass of water = 16.8 grams
Molar mass of water = 18.02 g/mol
Step 2: Calculate number of moles of methyl alcohol
Number of moles methyl alcohol = Mass / molar mass
Number of moles methyl alcohol = 1.20 grams / 32.04 grams
Number of moles methyl alcohol = 0.0375 moles
Step 3: Calculate number of moles of water
Moles H2O = 16.8 grams / 18.02 g/mol
Moles H20 = 0.932 moles
Step 4: Calculate total number of moles
Total number of moles = moles CH3OH + moles H2O = 0.0375 moles + 0.932 moles = 0.9695 moles
Step 5: Calculate mole fraction of the solute
Solute = methyl alchol
(Solvent = water)
Mole fraction = 0.0375 moles / 0.9695 moles
Mole fraction = 0.0387
The mole fraction of the solute, methyl alcohol, is 0.0387
