Write the thermochemical equation for each of the following. Be sure to give the physical state for all reactants and products in the chemical equation and use the appropriate, complete symbol for the enthalpy change, including units.
a. The standard enthalpy of formation of water.
b. The standard bond dissociation enthalpy for H2 at 298K.
c. The standard enthalpy of combustion of liquid methanol.
3. What do we mean by the reference state?
4. Why is the standard enthalpy of formation of an element in its reference state zero at all temperatures? 5. What is the standard enthalpy of formation of 1.00 g O2(g) at 350 K? Cp,m = 29.6 J/K•mol for O2(
Write the thermochemical equation for each of the following. Be sure to give the physical state...
Calculate the standard enthalpy of formation of liquid water
(H2O) using the following thermochemical
information:
CH4(g) C(s) + 2 H2(g)
H = +74.8 kJ
CO2(g) C(s) + O2(g)
H = +393.5 kJ
CO2(g) + 2 H2O(l) CH4(g) + 2 O2(g)
H = +890.4 kJ
Calculate the standard enthalpy of formation of liquid water
(H2O) using the following thermochemical
information:
2 HNO3(l)
N2O5(g) +
H2O(l)
H = +92.0 kJ
2 N2(g) + 5
O2(g) 2 N2O5(g)
H = +59.3 kJ
N2(g) + 3
O2(g) + H2(g) 2 HNO3(l)
H = -348.2 kJ
Question 3 Propane (C3H8) undergoes combustion according to the following thermochemical equation: C3H8(g) + 5 O2(g) -- 3 CO2(g) + 4H2O(g) Arxn = -2043.0 kJ Substance Heat of Formation (kJ/mol) CO2(g) -393.5 H2O(g) -241.8 O2(g) 0 C3H8(g) ? Calculate the standard enthalpy of formation of propane C3H8 a. -104.7 kJ/mol ob. +1407.7 kJ/mol C. -1407.7 kJ/mol O d. +104.7 kJ/mol o e. -4190.7 kJ/mol
Calculate the standard enthalpy of formation of liquid water
(H2O) using the following thermochemical
information:
2
B2O3(s) 4 B(s) + 3 O2(g)
H = +2509.1 kJ
B2O3(s)
+ 3 H2O(l) B2H6(g) + 3
O2(g)
H = +2147.5 kJ
2 B(s) + 3 H2(g)
B2H6(g)
H = +35.4 kJ
H = ______ kJ
1. Define the term standard state. 2. Distinguish between an endothermic and an exothermic process. 3. Write the thermochemical equation for the standard enthalpy of fusion of He at 3.5 K. Be sure to give the physical state for all reactants and products in the chemical equation and use the appropriate, complete symbol for the enthalpy change, including units. 4. Consider the first (Ei1) and second (Ei2) standard enthalpy of ionization values for Na and Mg given in Table 2E.2...
Which thermochemical equation gives the value of the standard enthalpy of formation for NH4C104(s)? N(g) + 2 H2(g) + CI(g) + 2 O2(g) ---> NH4C104(s) N(g) + 2 H2(g) + Cl2(1) +2 O2(g) ---> NH4C104() 1/2 N2(g) + 2 H2(g) + 1/2 C12(g) + 2 O2(g) ---> NH4C104(s) N(g) + 4 H(g) + Cl(g) + 4 0(g) ---> NH4C104(8) ON(g) + 2 H2(g) + C1(g) + 2 02(9) ---> NH4C104(s) ON(g) + 2 H2(g) + C12(1) + 2 02(E) --->...
Question 3 Propane (C3Hg) undergoes combustion according to the following thermochemical equation: C3H8(g) + 5 O2(g) - 3 CO2(g) + 4H2O(g) AHrxn=-2043.0 kJ Substance Heat of Formation (kJ/mol) CO2(g) -393.5 H2O(g) -241.8 O2(g) 0 C3H8(g) ? Calculate the standard enthalpy of formation of propane C3Hg a. -104.7 kJ/mol O b. +1407.7 kJ/mol O C. -1407.7 kJ/mol O d. +104.7 kJ/mol o e. -4190.7 kJ/mol uestion 4 Consider the evaporation of liquid water to water vapor at 125°C. What is true...
For each of the following compounds, write a balanced thermochemical equation depicting the formation of one mole of the compound from its elements in their standard states and use Appendix C in the textbook to obtain the value of ΔH∘f. Part G For NH4NO3(s) write a balanced thermochemical equation. Express your answer as a chemical equation. Identify all of the phases in your answer. Part H For NH4NO3(s) find the value of ΔH∘f. Express your answer using four significant figures.
Given the following thermochemical equation: 2 Al + Fe_2O_2 rightarrow Al_2O_2 + 2Fe delat H = - 852 kJ What is Delta H when 0.100 mal of Al_2O_3 react with 0.250 mol of Fe? _____ kJ Using the data from Appendix G of the textbook, calculate Delta H for the combustion of 1.00 mole of C_2H_5OH(l). Note that (g) or (l) after the chemical formula denotes whether the compound is a gas or liquid. Some compounds have entries for both....
Which of the following reactions corresponds to the thermochemical equation for the standard molar enthalpy of formation of solid zinc nitrate? a. Zn(s) + 2N(g) + 6O(g) → Zn(NO3)2(s) b. Zn(s) + 2HNO3(aq) → Zn(NO3)2(s) + H2(g) c. Zn(OH)2(s) + 2HNO3(aq) → Zn(NO3)2(s) + 2H2O() d. Zn2+(aq) + 2NO3–(aq) → Zn(NO3)2(s) e. Zn(s) + N2(g) + 3O2(g) → Zn(NO3)2(s)