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 find the percentage of KClO3 in the mixture, we need to calculate the mass of KClO3 that was present in the sample before heating.
Let's start by calculating the mass of the mixture after heating:
Mass of the mixture after heating = Mass of the sample - Mass loss
Mass of the mixture after heating = 2.4375 g - 0.6191 g
Mass of the mixture after heating = 1.8184 g
Next, we need to determine the mass of NaCl in the mixture. Since NaCl doesn't undergo any mass change during heating, the mass loss of 0.6191 g is due to the decomposition of KClO3.
Now, we can calculate the mass of KClO3:
Mass of KClO3 = Mass of the mixture after heating - Mass of NaCl
Mass of KClO3 = 1.8184 g - 0.6191 g (mass loss)
Mass of KClO3 = 1.1993 g
Finally, we can find the percentage of KClO3 in the mixture:
Percentage of KClO3 = (Mass of KClO3 / Mass of the mixture after heating) x 100
Percentage of KClO3 = (1.1993 g / 1.8184 g) x 100
Percentage of KClO3 ≈ 65.89%
Therefore, the mixture contains approximately 65.89% of KClO3.