a 2.4375 g sample containing a mixture of KClO3 + NaCl is heated and undergoes a mass loss of 0.6191g. What percent of KClO3 is in the mixture?

To determine the percentage of KClO3 in the mixture, we need to calculate the mass of KClO3 in the sample and then use this value to find the percentage.

First, let's find the mass of KClO3 in the mixture. We know that the sample initially weighs 2.4375g and loses 0.6191g during heating. Therefore, the final mass of the sample after the mass loss is 2.4375g - 0.6191g = 1.8184g.

Since we want to find the mass of KClO3 in the mixture, we need to calculate the difference between the initial mass of the sample and the final mass after the mass loss, which represents the mass of NaCl:

Mass of NaCl = Initial mass - Mass loss = 2.4375g - 1.8184g = 0.6191g.

Now, to determine the mass of KClO3, we subtract the mass of NaCl from the initial mass of the sample:

Mass of KClO3 = Initial mass - Mass of NaCl = 2.4375g - 0.6191g = 1.8184g.

Finally, to calculate the percentage of KClO3 in the mixture, we divide the mass of KClO3 by the initial mass of the sample and multiply by 100:

Percentage of KClO3 = (Mass of KClO3 / Initial mass) x 100
= (1.8184g / 2.4375g) x 100
≈ 74.58%.

So, the percent of KClO3 in the mixture is approximately 74.58%.