25g of NaCl is deissolved in 100g of water. what is the concentration in percentage by mass?
Question -1
Percent by mass of the solution= mass of NaCl/total mass= 25g of NaCl/25 g of NaCl +100g of H2O
Question-2
Density =mass/volume, solve for volume
Solve for moles
moles of NaCl=25g of NaCl/58.44 g of NaCl/mol
Solve for Volume
mass/density=volume=125g of total solution/1.15g/ml=volume of total solution
The units for volume are in mL, so multiply that by 10^-3 to convert to L.
Molarity=moles/Liters=moles of NaCl/volume of total solution (L)
To calculate the concentration in percentage by mass, you need to divide the mass of the solute by the mass of the solution and then multiply by 100.
Given:
Mass of NaCl = 25g
Mass of water = 100g
Step 1: Calculate the mass of the solution.
Mass of the solution = Mass of NaCl + Mass of water
Mass of the solution = 25g + 100g
Mass of the solution = 125g
Step 2: Calculate the concentration in percentage by mass.
Concentration (%) = (Mass of NaCl / Mass of the solution) × 100
Concentration (%) = (25g / 125g) × 100
Concentration (%) = 0.2 × 100
Concentration (%) = 20%
Therefore, the concentration of NaCl in the solution is 20% by mass.
To find the concentration of NaCl in percentage by mass, you need to calculate the mass of NaCl in the solution and express it as a percentage of the total mass of the solution.
First, add the mass of NaCl (25g) to the mass of the water (100g) to get the total mass of the solution:
Total mass = mass of NaCl + mass of water
Total mass = 25g + 100g = 125g
Now, calculate the concentration of NaCl in the solution:
Concentration = (mass of NaCl / total mass of solution) × 100%
Substituting the values:
Concentration = (25g / 125g) × 100%
Concentration = (0.2) × 100%
Therefore, the concentration of NaCl in the solution is 20% by mass.