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Test #1 - Energetics
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Test #1 - Energetics
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by Trudy Jackson
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4 Questions
1
5
Calculate the standard enthalpy of formation of gaseous diborane (B2H6) using the following thermochemical information:
4B (s) + 3O2 (g)
β\rightarrow
β 2B2O3 (s);
Ξ\Delta
Ξ H = -2509.1 kJ
2H2 (g) + O2 (g)
β\rightarrow
β 2H2O (l);
Ξ\Delta
Ξ H = -571.7 kJ
B2H6 (g) + 3O2 (g)
β\rightarrow
β B2O3 (s) + 3H2O (l);
Ξ\Delta
Ξ H = -2147.5 kJ
(click below to write/draw)
=
B2H6(G)
2B(S)+3H2
Show Your Work
2
5
Hydrogen cyanide can be prepared by the reaction:
CH4 (g) + NH3 (g)
β\rightarrow
β HCN (g) + 3H2 (g)
What is the heat of reaction at constant pressure? Use the following thermochemical equations:
N2 (g) + 3H2 (g)
β \rightarrow
β 2NH3 (g);
Ξ\Delta
Ξ H = -91.8 kJ
C (graphite) + 2H2 (g)
β\rightarrow
β CH4 (g);
Ξ\Delta
Ξ H = -74.9 kJ
H2 (g) + 2C (graphite) + N2 (g)
β\rightarrow
β2HCN (g);
Ξ \Delta
Ξ H = 270.3 kJ
(click below to write/draw)
3
5
Complete the following Born Haber cycle for barium phosphide, Ba3P2.
(click below to write/draw)
Show Your Work
4
5
Use bond energies to estimate
Ξ\Delta
ΞH for the reaction below:
(click below to write/draw)
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Hydrogen cyanide can be prepared by the reaction:
CH4 (g) + NH3 (g)
β\rightarrow
β HCN (g) + 3H2 (g)
What is the heat of reaction at constant pressure? Use the following thermochemical equations:
N2 (g) + 3H2 (g)
β \rightarrow
β 2NH3 (g);
Ξ\Delta
Ξ H = -91.8 kJ
C (graphite) + 2H2 (g)
β\rightarrow
β CH4 (g);
Ξ\Delta
Ξ H = -74.9 kJ
H2 (g) + 2C (graphite) + N2 (g)
β\rightarrow
β2HCN (g);
Ξ \Delta
Ξ H = 270.3 kJ
Answers: 2
Chemistry, 22.06.2019 11:00
Problem page combustion of hydrocarbons such as pentane ( c5 h12 ) produces carbon dioxide, a "greenhouse gas." greenhouse gases in the earth's atmosphere can trap the sun's heat, raising the average temperature of the earth. for this reason there has been a great deal of international discussion about whether to regulate the production of carbon dioxide.(a) write a balanced chemical equation, including physical state symbols, for the combustion of liquid pentane into gaseous carbon dioxide and gaseous water. (b) suppose 0.350 kg of pentane are burned in air at a pressure of exactly 1 atm and a temperature of 20.0 degree c. calculate the volume of carbon dioxide gas that is produced.be sure your answer has the correct number of significant digits.
Answers: 2
Chemistry, 22.06.2019 13:30
Ants live on acacia trees in south america. the ants feed on sugars secreted by the trees. the trees provide room for the ants to live. the ants sting any other insect or animal that comes to eat the trees. what type of relationship is this?
Answers: 1
Chemistry, 22.06.2019 16:40
Let the ed50 of a recreational drug be defined as the amount required for 50% of a test group to feel high or get a buzz. if the ed50 value of ethanol is 470 mg/kg body mass, what dose would a 70 kg party goer need to quickly consume in order to have a 50% chance of getting a buzz? 235 mg 470 mg 32,900 mg 35,000,000 mg
Answers: 3
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