at 20 degree Celsius, 65.2 g of KBr will dissolve in 100 g of water. what is the mass percent of KBr in water ?

%w/w = (mass solute/mass solution)*100 =?

% = [(65.2/(65.2+100)]*100 =

To find the mass percent of KBr in water, we need to calculate the mass of KBr in the solution and then divide it by the total mass of the solution, and finally multiply by 100.

First, let's find the mass of KBr in the solution:
Mass of KBr = 65.2 g

Next, let's find the total mass of the solution:
Mass of water = 100 g

Now, we can calculate the mass percent of KBr in the solution:
Mass percent of KBr = (Mass of KBr / Total mass of solution) * 100

Substituting the values, we have:
Mass percent of KBr = (65.2 g / (65.2 g + 100 g)) * 100

Calculating the expression inside the parentheses:
Total mass of solution = 65.2 g + 100 g
Total mass of solution = 165.2 g

Now, substituting the value into the equation:
Mass percent of KBr = (65.2 g / 165.2 g) * 100

Calculating the expression inside the parentheses:
Mass percent of KBr = 0.3945 * 100

Finally, calculating the percentage:
Mass percent of KBr = 39.45%

Therefore, the mass percent of KBr in water is approximately 39.45%.