Measurements show that the energy of a mixture of gaseous reactants decreases by 285. kJ during a certain chemical reaction, which is carried out at a constant pressure. Furthermore, by carefully monitoring the volume change it is determined that 114. kJ of work is done on the mixture during the reaction. Calculate the change in enthalpy of the gas mixture during the reaction. Round your answer to 3 significant digits. Is the reaction exothermic or endothermic? O exothermic O endothermic X 5

A 1.37 g sample of butane, C4H10(g), was burned in a bomb calorimeter in the presence of excess oxygen. The calorimeter contained 1.09 kg of water. Calculate the heat exchanged with respect to the system during the reaction if the calorimeter has a heat capacity of 648. J/°C and the temperature of the calorimeter and water changed from 23.6°C to 35.6°C? Enter your answer to 3 significant figures in decimal form. Do not enter units since they are already given. 58.12 kJ Calculate the heat exchanged with respect to the system per mole of butane. Enter your answer to 3 signficant figures in decimal form. Do not enter units since they are already given.’ 2547.5 kJ

Measurements show that the energy of a mixture of gaseous reactants increases by 396. kJ during a certain chemical reaction, which is carried out at a constant pressure. Furthermore, by carefully monitoring the volume change it is determined that 122. kJ of work is done on the mixture during the reaction. Calculate the change in enthalpy of the gas mixture during the reaction. Be sure your answer has the correct number of significant digits. O exothermic Is the reaction exothermic or endothermic? O endothermic

Measurements show that the enthalpy of a mixture of gaseous reactants decreases by 323. kJ during a certain chemical reaction, which is carried out at a constant pressure. Furthermore, by carefully monitoring the volume change it is determined that -162. kJ of work is done on the mixture during the reaction. Calculate the change in energy of the gas mixture during the reaction. Round your answer to 3 significant digits. Is the reaction exothermic or endothermic? kJ exothermic O endothermic x10 X 3

A 55.1g sample of polystyrene, which has a specific heat capacity of 1.880·J·g−1°C−1, is put into a calorimeter (see sketch at right) that contains 200.0g of water. The temperature of the water starts off at 25.0°C. When the temperature of the water stops changing it's 31.9°C. The pressure remains constant at 1atm . Calculate the initial temperature of the polystyrene sample. Be sure your answer is rounded to the correct number of significant digits.

As a system increases in volume, it absorbs 52.0 J of energy in the form of heat from the surroundings. The piston is working against a pressure of 0.597 atm. The final volume of the system is 58.6 L. What was the initial volume of the system if the internal energy of the system decreased by 106.2 J? Volume =  L

A chemical reaction takes place inside a flask submerged in a water bath. The water bath contains 4.70 kg of water at 38.7 °C. During the reaction 55.6 kJ of heat flows out of the flask and into the bath. Calculate the new temperature of the water bath. You can assume the specific heat capacity of water under these conditions is -1 4.18 J∙g¯¹·K¯¹. Be sure your answer has the correct number of significant digits. 心。 °℃ x10 S

Measurements show that the energy of a mixture of gaseous reactants decreases by 373. kJ during a certain chemical reaction, which is carried out at a constant pressure. Furthermore, by carefully monitoring the volume change it is determined that 136. kJ of work is done on the mixture during the reaction. Calculate the change in enthalpy of the gas mixture during the reaction. Round your answer to 3 x10 significant digits. exothermic Is the reaction exothermic or endothermic? endothermic

Measurements show that the enthalpy of a mixture of gaseous reactants increases by 195.kJ during a certain chemical reaction, which is carried out at a constant pressure. Furthermore, by carefully monitoring the volume change it is determined that 69.kJ of work is done on the mixture during the reaction.  Calculate the change in energy of the gas mixture during the reaction. Be sure your answer has the correct number of significant digits. Is the reaction exothermic or endothermic?