Question

Home Assignment: Chapter 5: Thermochemistry 12) At what velocity (m/s) must a 20.0 g object be moving in order to possess a kinetic energy of 1.00 )? A) 1.00 B) 100x10 C) 10.0 D) 1.00x10 E) 50.0 13) The value of AE for a system that performs 111 kJ of work on its surroundings and gains 89 kJ of heat A)-111 B)-200 C) 200 D) -22 E) 22 14) The British thermal unit (Btu) is commonly used in engineering applications. A Btu is defined as the amount of heat required to raise the temperature of 1 lb of water by 1 °F. There are joules in one Btu. 1 lb = 453.59 g; °C = (5/9/°F - 32); specific heat of H20 (1) = 4.184 J/g-K. A) 3415 B) 60.29 C) 1054 D) 5.120x10 E) Additional information is needed to complete the calculation 15) A 22.44 g sample of iron absorbs 180.8 J of heat, upon which the temperature of the sample increases from 21.1°C to 39.0 °C. What is the specific heat of iron? A) 0.140 B) 0.450 C) 0.820 D) 0.840 E) 0.900 16) Consider the following two reactions: A-2B A+ AH AH = 456.7 kJ/mol -22.1kJ/mol Determine the enthalpy change for the process: 2B-C A) -478.8 kJ/mol B)-434.6 kJ/mol C) 434.6 kJ/mol D) 478.8 kJ/mol E) More information is needed to solve the problem.

Answer 1

| 12 KG 2 I mye VoVelouły mass - 1 I = 1 X 20x10 3 x v² V = 1X2 = 100 20x103 " Eva lo mle B DE = 3 q + w 89 +(-111) = -22 KJ,