Chemistry - Thermochemistry Question with Solution | TestHub
2MnO4- + 16H+ + 10Cl- → 2Mn2+ + 5Cl2(g) + 8H2O
Above reaction is endothermic and hence the actual temperature of the reaction vessel (isolated from the surrounding) may be different from that expected. Given that the initial temperature of the reaction vessel was used in the calculations, how would this affect the predicted value of moles of Cl2 (n), according to equation: n = PV/RT
Options:
Answer:
Solution:
The reaction is endothermic, causing the isolated vessel to cool. Therefore, the actual temperature (Tactual) is lower than the initial temperature (Tinitial) used in the ideal gas law equation, n = PV/RT.
If we use a temperature that is too high in the denominator of the equation, the calculated number of moles (n) will be too small. Consequently, the predicted value will be less than the actual value. This corresponds to option (b).
