Thermochemistry 看大家会不会

piggiek

1. A small petrol car use octane as a fuel and it needs 3.6x10^4 kJ totravel 100 km. Calculate the cost of petrol consume per kilometre[Standard heat of combustion of octane = -5470 kJ mol-1; density ofoctane = 0.66 g mL -1 ; cost of octane = RM 1.85 L -1]

2. 6 dm3(mixture at room conditions) of a mixture of propane and butane oncomplete combustion rises 10kg of water through 15.6 celcius. Calculatethe percentage composition of the mixture by volume [Standard heat ofcombustion for (i) propane = -2220 kJ mol-1 (ii) butane = -2877 kJmol-1]