I don't understand this stoich problem ;-;
Posted: Sun Oct 08, 2023 6:41 pm
A 26.6 g sample of impure potassium nitrate (KNO3) was heated to complete decomposition according to the equation
2 KNO3(s) → 2 KNO2(s) + O2(g) .
After the reaction was complete, the solid residue (consisting of KNO2 and the original impurities) had a mass of 23.1 g. Assuming that only the potassium nitrate had decomposed, what was the percent KNO3 in the original sample?
Answer in units of %.
I did this: (2 *(26.6 - 23.1)*101.103*100% ) / (32.00)(26.6)
which got 84%, but it says I'm wrong. Please help
2 KNO3(s) → 2 KNO2(s) + O2(g) .
After the reaction was complete, the solid residue (consisting of KNO2 and the original impurities) had a mass of 23.1 g. Assuming that only the potassium nitrate had decomposed, what was the percent KNO3 in the original sample?
Answer in units of %.
I did this: (2 *(26.6 - 23.1)*101.103*100% ) / (32.00)(26.6)
which got 84%, but it says I'm wrong. Please help