Indicate how each of the following errors would affect (increase, decrease, or n
ID: 947355 • Letter: I
Question
Indicate how each of the following errors would affect (increase, decrease, or no change) your calculated value for the molar volume of O_2 at STP (assuming that you complete the experiment otherwise correctly). In each case, explain your answer. Your sample was not completely decomposed. After you finish heating your sample and the system cooled to room temperature, you closed the clamp on tube D without re-equalizing the pressures inside and outside of the flask. The water in beaker E was 4 inches deep and the water in flask C was 2 inches deep.Explanation / Answer
Solution :-
a)if the sample is not completely decomposed then all the KClO3 is not breaked down to form O2 gas therefore the experimental volume of the O2 gas formed would be less than the actual volume so the molar volume of the O2 formed would be low than actual.
b) If the pressures are not equilized then it will give the incorrect volume change for the gas produced so it will give the lower molar volume of the gas formed
2) when the sample is heated rapidly and it causes some of the solid to splatter out the vessel then it means it loss the reactant which would lead to the formation of the less moles of the O2 gas and hence when we calculate the mass of the KClO3 using the mole ratio of the O2 to KClO3 it will turn into the less moles of KClO3 which gives the lower mass of KClO3 hence the calculated percent of the KClO3 would be lower. (too low)