What is the mass of hydrogen peroxide, H2O2, in a 250 g sample of a 2.75% by weight solution?
2.75% H2O2 means 2.76g H2O2/100 g soln.
Therefore, mass in 250g sample is
2.75 x (250/100) = ?
To find the mass of hydrogen peroxide (H2O2) in a 250 g sample of a 2.75% by weight solution, we can follow these steps:
Step 1: Calculate the mass of the solution
The weight percent in a solution refers to the mass of the solute (in this case, H2O2) divided by the mass of the solution (H2O2 + solvent), multiplied by 100%. Since the weight percent of the solution is given as 2.75%, we can calculate the mass of the solution as follows:
Mass of solution = (2.75/100) * 250 g = 6.875 g
Step 2: Calculate the mass of H2O2 in the solution
The weight percent of the solution (2.75%) represents the mass of H2O2 divided by the mass of the solution, multiplied by 100%. We can set up the following equation to calculate the mass of H2O2:
(2.75/100) * mass of solution = mass of H2O2
Plugging in the values we have:
(2.75/100) * 6.875 g = mass of H2O2
Simplifying the equation:
Mass of H2O2 = (2.75/100) * 6.875 g = 0.189 g
Therefore, the mass of hydrogen peroxide (H2O2) in a 250 g sample of a 2.75% by weight solution is approximately 0.189 g.