the mass percent of a solution prepared by dissolving 0.500 moll KCL ( Molar mass = 74.6 g) in 850 g of water is ?
Oh, so we're dissolving some KCL, also known as potassium chloride! Well, let's crunch some numbers and sprinkle some humor, shall we?
To find the mass percent, we need to divide the mass of the solute (KCL) by the mass of the solution (KCL + water), and then multiply it by 100.
Step 1: Calculate the mass of KCL:
Mass of KCL = 0.500 mol × 74.6 g/mol = 37.3 g
Step 2: Calculate the mass of the solution:
Mass of water = 850 g
Mass of solution = Mass of KCL + Mass of water
Mass of solution = 37.3 g + 850 g = 887.3 g
Step 3: Calculate the mass percent:
Mass percent = (Mass of KCL / Mass of solution) × 100
Mass percent = (37.3 g / 887.3 g) × 100
Mass percent = 4.2%
Voila! The mass percent of KCL in the solution is approximately 4.2%. Keep calm and dissolve on!
To calculate the mass percent of the solution, you need to know the mass of the solute (KCl) and the mass of the entire solution.
1. Start by calculating the mass of KCl:
Mass of KCl = moles of KCl × molar mass of KCl
Given that moles of KCl = 0.500 mol and molar mass of KCl = 74.6 g/mol:
Mass of KCl = 0.500 mol × 74.6 g/mol
2. Calculate the mass of the solution:
Mass of solution = mass of water + mass of KCl
Given that mass of water = 850 g and mass of KCl = calculated in step 1.
3. Calculate the mass percent of the solution:
Mass percent = (mass of KCl / mass of solution) × 100
Plugging in the values, you can now calculate the mass percent.
To calculate the mass percent of a solution, you need to determine the mass of the solute and the mass of the entire solution.
Given:
- The molar mass of KCl (potassium chloride) is 74.6 g/mol.
- You dissolved 0.500 mol of KCl in 850 g of water.
Now let's calculate the mass of the solute (KCl):
Mass of KCl = Number of moles × Molar mass
Mass of KCl = 0.500 mol × 74.6 g/mol
Mass of KCl = 37.3 g
Next, let's calculate the mass of the solution:
Mass of solution = Mass of solute + Mass of water
Mass of solution = 37.3 g + 850 g
Mass of solution = 887.3 g
Now, we can calculate the mass percent of the solute in the solution:
Mass percent = (Mass of solute ÷ Mass of solution) × 100
Mass percent = (37.3 g ÷ 887.3 g) × 100
Mass percent ≈ 4.20%
Therefore, the mass percent of the solution prepared by dissolving 0.500 mol KCl in 850 g of water is approximately 4.20%.
mass KCl = mols x molar mass.
% w/w KCl = [grams KCl/(g KCl + 850)]*100 = ?