Calculate the mass percent of 3.97 g KCl dissolved in 51.1 g H2O.

Answer 1

First get the total mass by adding 3.97g +51.1g = 55.07g

Then take the fraction of KCl of the total: 3.97g / 55.07g = 0.07209

And to get this into percent form, multiply by 100%, 0.07209 * 100% = 7.21%