Measurements show that the energy of a mixture of gaseous reactants decreases by 274. 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 -89. 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? kJ O exothermic O endothermic x10 X

A student mixed 50.0 mL of 2.00 mol/L HNO3(aq) with 50.0 mL of 2.00 mol/L KOH(aq) in a calorimeter. The final mass of the resulting solution was 100.0 g and the change in temperature of the resulting solution was recorded over time, as shown in the graph below. Temperature (°C) kJ. 36.0 34.0 32.0 30.0 28.0 Select one: O positive O negative 26.0 24.0 Assume that the specific heat capacity of the final solution is equal to that of water (4.19 Joules per gram per degree C) and that the calorimeter neither gained nor lost heat. The energy transferred to the resulting solution in the student's experiment was Calorimetry 22.0 0.00 1.00 2.00 3.00 4.00 5.00 Time (s) Record your 3-digit answer; do not include sign or units. From these observations it can be concluded that the neutralization reaction is Select one: O exothermic O endothermic When calculated, the resulting molar enthalpy of neutralization would be recorded as

3. 50.0 mL of 1.0 M sodium hydroxide and 50.0 mL of 1.0 M hydrochloric acid, both at 22.5 °C, were mixed together in a calorimeter. The temperature increased to 29.2 °C. Determine enthalpy of the reaction. You may assume that both solutions have the same density and heat capacity of water (d = 1.00 g/mL, SH=4.184 J/g°C). Remember, AH = q at constant pressure.

A chemical reaction takes place inside a flask submerged in a water bath. The water bath contains 3.50 kg of water at 38.6 °C. During the reaction 131. 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 4.18·J·g^−1K^−1. Round your answer to 3 significant digits.

A total of 2.00 molmol of a compound is allowed to react with water in a foam coffee cup and the reaction produces 180 gg of solution. The reaction caused the temperature of the solution to rise from 21.00 to 24.70 ∘C∘C. What is the enthalpy of this reaction? Assume that no heat is lost to the surroundings or to the coffee cup itself and that the specific heat of the solution is the same as that of pure water (4.184 J/g-C).

A gas is heated by adding 30. kJ of heat to the gas.  As it heats, it also expands from 30. L to 50. L, and the gas performs 2 kJ of work on the external environment during the expansion.  What is the change in internal energy (ΔE) of the gas?

Measurements show that the energy of a mixture of gaseous reactants decreases by 209. 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 -104. 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. Is the reaction exothermic or endothermic? O exothermic O endothermic X

Measurements show that the energy of a mixture of gaseous reactants increases by 275. 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 109. 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? kJ exothermic O endothermic x10 X S ? OFF olo Ar

A calorimeter holds 55 g water at 21.0°C. A sample of hot iron is added to the water. The final temperature of the water and iron is 24.0°C. What is the change in enthalpy associated with the change in the water's temperature?

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