A solution contains 25 grams of KNO3 dissolved in 200. grams of H2O. Which numerical setup can be used to calculate the percent by mass of KNO3 in this solution?

% = 11.11%

Explanation:

To get the %m/m of any solution we should use the following expression:

%m/m = m solute / m solution * 100

we have the mass of solute, but not the mass of solution, however this can be calculated. solution is made using solute and solvent so:

m solution = 25 + 200 = 225 g

Now that we have the mass of solution, we can calculate the %:

%m/m = 25 / 225 * 100

%m/m = 11.11%

This is the %m/m of this solution

a. a clone will be physically identical to the original, but won’t be genetically identical

have a good day!

c. because step up transformer steps up the input voltage i.e increases the input voltage  

the number of turns are greater on the secondary side of step up transformer  

transformer does not handle dc current