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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 09:00
This chart lists four kinds of polymers and their sources. what can be known about all four polymers, despite their differences? they come from living things. they share ionic carbon bonds. they are at least 100 monomers long. they are made of repeating subunits.
Answers: 2
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