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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, 21.06.2019 18:00
How is the composition of a meteorite relevant to finding out the composition of earth's core?
Answers: 3
Chemistry, 22.06.2019 02:40
How many liters of hydrogen gas will be produced at stp from the reaction of 7.179Γ10^23 atoms of magnesium with 54.219g of phosphoric acid (h3po4) the equation is 3mg + 2h3(> mg(po4)2+3h2
Answers: 1
Chemistry, 22.06.2019 23:00
In which region is the substance in both the solid phase and the liquid phase? 1 2. 3 4 mark this and return save and exit next
Answers: 2
Chemistry, 22.06.2019 23:00
What prefix multiplier is appropriate for reporting a measurement of 5.57 Γ10β5 m?
Answers: 1
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