11.A 225.O gram sample of copper absorbs 735 J of heat from its surroundings. wh
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11.A 225.O gram sample of copper absorbs 735 J of heat from its surroundings. what is the temperature change for copper sample? (specific heat = 0.387 J g-1C 1 for copper) 6-3 a. 64.0 °C b. 8.44°C c. 92.2 °C d. 117.3 C e. 156.7 C 26. Determine the enthalpy change, AH, for the reaction, N2(g) + 2H2(g) N2H4(l), given the following thermochemical equations: N2H4(l) + O2(g) 2H20(l) + N2(g)AH=-622.0 kJ 6-6 H2(g) + ½ O2(g) H2O(l)AH--285.9 kla- 151.7 kJ b. -236.2 kJ c. +106.1 kJ d. +50.2 kJe. +567.4 k 29. The thermochemical equation which is associated with o Hf, the standard enthalpy of formation for glucose, C6H1206(s), is a. 6 C(s) + 6 H 20(1)-> C6H1206(s) b. 6C(s) + 12 H(g) + 6 0(g) C6H1206(s) c. 6E(s) + 6 H2 (g) + 302(g) -> C6H1206(s) d. 2 C2H5OH (l) + 2 CO2(g) C6H1206(s) e, 6 C(g) + 6 H2 (g) + 3 02(g) C6H1 206(s 30. Given the equation for the reaction, CO2(g) + 4H2(g) CH4(g) + 2H20(g), and the following standard enthalpies of formation, o f : CO2 (g):393.5 kJ mol-1 CH4(g):-74.8 kJ mol-1 H20(8):-241.8 kJ mol-1 H20(): -285.8 kJ mol-1 what is the standard enthalpy of reaction, in kJ for the reaction shown? 6-7 a.-164.9 kJ b +76.9 kJ c. -164.9 kJ d. +978.3 kl e. +995 31, Given the equation for the reaction, 4 NH3(g) + 7O2(g) 4NO2(g) + 6H20(g) and the following standard enthalpies of formation,AHf : NH 3 (g):-80.3 kJ mol 1 NO2 (g): +33.2 KJ mol-1 H20(g):-241.8k) mol-1 H20(0:-285.8 kJ mol-1 what is the standard enthalpy of reaction, in kd for the reaction shown?a. -172.3 ki b.- 128.3 kJc. +157.5 ki d. 996.8 kJe. +1003.8 kExplanation / Answer
11)
Q = 735 J
m = 225 g
c = 0.387 J/g.oC
Ti = 0 oC
use:
Q = m*C*delta T
735.0 = 225.0*0.387*delta T
delta T = 8.44 oC
Answer: b
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