During an exothermic chemical reaction, a system becomes warmer, and the chemica

Question

During an exothermic chemical reaction, a system becomes warmer, and the chemical substances undergo an increase in potential energy. a system becomes warmer, and the chemical substances undergo a decrease in potential energy. a system becomes cooler, and the chemical substances undergo an increase in potential energy a system becomes cooler, and the chemical substances undergo a decrease in potential energy. a system becomes warmer, and additional heat is gained front the surroundings For a chemical reaction taking place at constant pressure, which one of the following is true? Delta Hsystem = (Kinetic Energy)system + (Potential Energy)system Delta Hsystem = (Kinetic Energy)system - (Potential Energy)system Delta Hsystem = Delta Esystem - qp Delta Hsystem = Delta Esystem + P Delta Vsystem Delta Hsystem = Delta Esystem+ qp When nitrogen gas reacts with hydrogen gas to form ammonia, 92.38 kJ of heat are given off for each mole of gas consumed, under constant pressure and standard conditions. What is the correct value for the standard reaction in the thermochemical equation below when 0.750 mol of hydrogen reacts? N2(g) + 3H2(s) rightarrow 2NH3(g) + 34.5 kJ - 98.3 kJ + 59.2 kJ -59.2 kJ -23.1 kJ Consider the following thermochemical equation: 2NO(g) + O2(g) rightarrow 2 NO2(g) Delta H degree = -113.2 kJ Calculate Delta H degree for the reaction below: 4 NO2(g) + 4NO(g) t 2O2(g) Delta H degree = ? + 334.5 kJ - 146.19 kJ + 226.4 kJ - 509.2 kJ + 192.38 kJ Determine the enthalpy change, Delta H, for the reaction, W(s) + C(s) rightarrow WC(s), given the following thermochemical equations: + 33.3 kJ - 38.2 kJ + 106.1 kJ -52.9 kJ +177.4 kJ 12 What is the wavelength of electromagnetic radiation which has a frequency of 5.732 * '4 s'1? A. l.7I8x |0"m B. 1.912 x 106m C. 5.230 xl0*7m D. 523.0 m E. 5.819 x| 2WOi(s) + 2C02(g) AH = -1680.8 kJ AH â-  -393.S kJ AH = -2391.4 kJ

Explanation / Answer

Right answer: B. A system becomes warmer an the chemical substances undergo a decrease in potential energy

During an exothermic reaction, the energy of the molecules involved in the reaction is released as heat. And the energy of the resulting products its lower than the energy from the molecules at the beginning of the reaction.

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