Chemistry 1. A pool of lava exhibits Group of answer choices nuclear energy thermal energy potential energy due to position potential energy due to composition 2. Determine the heat required to raise the temperature of a gold nugget (mass = 376 g) that starts at 25.0 oC and is heated to 125 oC. The specific heat capacity of gold is 0.128 J/g°C. Use correct units and amount of sig.figs. 4.81kJ/mol 4812.8J 4812.8kJ 4.8128J 4.81kJ
Chemistry
1. A pool of lava exhibits
Group of answer choices
nuclear energy
thermal energy
potential energy due to position
potential energy due to composition
2.
Determine the heat required to raise the temperature of a gold nugget (mass = 376 g) that starts at 25.0 oC and is heated to 125 oC. The specific heat capacity of gold is 0.128 J/g°C. Use correct units and amount of sig.figs.
4.81kJ/mol
4812.8J
4812.8kJ
4.8128J
4.81kJ
A 4.682 g sample of phenol (C6H5OH, molar mass = 94.11 g/mol) was combusted in a bomb calorimeter with a heat capacity of 4.845 kJ/°C. If the temperature rose from 26.81°C to 56.95°C, determine the value of ΔH°comb for phenol. Use correct units and amount of sig.figs.
7265J/mol
2935.kJ
-688.8kJ/mol
2935.225kJ
-3051kJ/mol
-2935kJ/mol
Use the ΔH°f information provided to calculate ΔH° in kJ/molC2H6 for the reaction IS IT ENDOTHERMIC OR EXOTHERMIC?
2 C2H6(l) + 7 O2(g) → 4 CO2(g) + 6 H2Og)
ΔH°f (kJ/mol) 49.10 0 -393.5 -241.8
-1562, exothermic
-1463, endothermic
342, endothermic
3123, endothermic
-684.4, exothermic
Calculate the change internal energy (ΔE) for a system that is absorbing 214.0 kJ of heat and is performing 29500J of work on the surroundings.
-243.5
184.5kJ
-29286kJ
-184.5
243.5 kJ
29.714kJ.
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