A lab assistant prepared a potassium chloride solution for her class by dissolving 5.34 g of KCl in 152g of water. What is the mass percent of the solution she prepared?
Could you help me set this up/show me how to do this problem?
mass fraction = g solute/g soln
5.34g/(152 + 5.34) then change to percent by multiplying by 100.
I got 3.39%, correct?
Thanks
3.40%
nacl is cool
Certainly! To find the mass percent of the solution, we need to determine the mass of KCl in the solution and then calculate its percentage relative to the total mass of the solution.
Step 1: Find the mass of KCl in the solution.
The problem statement tells us that the lab assistant dissolved 5.34 g of KCl.
Step 2: Find the total mass of the solution.
The problem statement also tells us that 152 g of water was used. So, the total mass of the solution is the mass of KCl + mass of water = 5.34 g + 152 g = 157.34 g.
Step 3: Calculate the mass percent.
The mass percent is calculated by dividing the mass of KCl by the total mass of the solution and then multiplying by 100 to express it as a percentage.
Mass percent of KCl = (mass of KCl / total mass of solution) x 100
Plugging in the values we found:
Mass percent of KCl = (5.34 g / 157.34 g) x 100
Calculating this expression gives us the mass percent of the solution she prepared.