A gaseous mixture of ethane
Can you please help me solve these two problems in simple step by step:
3. A gaseous mixture of ethane, CH3CH3 and propane, CH3CH2CH3 weighing 1.000 g is burned in excess oxygen, O2(g) to form water, H2O(l) and 1676 mL of carbon dioxide, CO2(g) at 25.0 °C and 100 kPa. What was the percentage by mass of ethane in the original mixture?
5.Solid benzoic acid, C6H5COOH(s), is often used to determine the heat capacity of a bomb calorimeter, because the constant volume heat of combustion of this compound is known with high precision: qV = −26.434 kJ g −1. When a 1.756 g sample of C6H5COOH(s) was burned in excess O2(g) a particular bomb calorimeter, the temperature increased by 10.51 oC. In a second experiment, a 1.239 g sample of a compound with the formula C3H2O2(l) was burned in the same calorimeter and the temperature increased by 5.11 oC. Use these data, plus the information given below for CO2 and H2O, to estimate the standard enthalpy of formation, o Hf of C3H2O2(l) at 25 oC. o Hf values at 25 oC for CO2(g) and H2O(l) are 394 kJ mol1 and 286 kJ mol1 , respectively. [Hint: You need to understand and use the relationships among qV, qp, U and H.
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Posted 19 Jun 2017 12:06 AM
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