A.A scientist measures the standard enthalpy change for the
following reaction to be -2932.6 kJ :
2C2H6(g)
+ 7 O2(g)4CO2(g)
+ 6 H2O(g)
Based on this value and the standard enthalpies of formation for
the other substances, the standard enthalpy of formation of
CO2(g) is kJ/mol.
B.A scientist measures the standard enthalpy change for the
following reaction to be -138.9 kJ :
H2(g) +
C2H4(g)C2H6(g)
Based on this value and the standard enthalpies of formation for
the other substances, the standard enthalpy of formation of
C2H4(g)
is kJ/mol.
Consider reaction, 2 C2H6 (g) + 7 O 2 (g) 4 CO 2 (g) + 6 H2O (g)
The standard enthalpy change of reaction is given as
r H 0 = H 0 f ( products ) - H 0 f ( reactants )
H 0 f (products) = 4 H 0 f CO 2(g) +6 H 0 f H2O (g)
H 0 f (products) = 4 H 0 f CO 2(g) + 6 ( -241.82 kJ /mol) = 4 H 0 f CO 2(g) - 1450.092 kJ / mol
H 0f (reactants) =2 H 0 f C2H6 (g) + 7 H 0 f O 2(g)
H 0f (reactants) = 2 (-84.0 kJ/ mol ) + 7 ( 0 kJ /mol) = - 168 kJ / mol
From above calculated values , we can write
- 2932.6 kJ / mol = ( 4 H 0 f CO 2(g) - 1450.092 kJ / mol ) - ( - 168 kJ / mol )
- 2932.6 kJ / mol = ( 4 H 0 f CO 2(g) - 1450.092 kJ / mol ) + 168 kJ / mol
( 4 H 0 f CO 2(g) - 1450.092 kJ / mol ) = - 2932.6 kJ / mol - 168 kJ / mol = - 3100.6 kJ / mol
( 4 H 0 f CO 2(g) - 1450.092 kJ / mol ) = - 3100.6 kJ / mol
4 H 0 f CO 2(g) = - 3100.6 kJ / mol + 1450.092 kJ / mol = - 1650.51 kJ /mol
H 0 f CO 2(g) = - 1650.51 kJ /mol / 4 = - 412.6 kJ / mol
ANSWER : Standard enthalpy of formation of CO 2 = - 412.6 kJ / mol
PART 2
Consider reaction, C2H4 (g) + H 2 (g) C 2H6 (g)
The standard enthalpy change of reaction is given as
r H 0 = H 0 f ( products ) - H 0 f ( reactants )
H 0 f (products) = H 0 f C 2H6 (g) = - 84.0 kJ / mol
H 0f (reactants) = H 0 f C2H4 (g) + H 0 f H 2(g)
H 0f (reactants) = H 0 f C2H4 (g) + 0 kJ / mol = H 0 f C2H4 (g)
From above calculated values , we can write
- 138.9 kJ / mol = ( -84.0 kJ / mol ) - H 0 f C2H4 (g)
H 0 f C2H4 (g) = ( -84.0 kJ / mol ) + 138.9 kJ /mol
H 0 f C2H4 (g) = 54.9 kJ /mol
ANSWER : Standard enthalpy of formation of C2H4 (g) = 54.9 kJ / mol
A.A scientist measures the standard enthalpy change for the following reaction to be -2932.6 kJ :...
1. A scientist measures the standard enthalpy change for the following reaction to be -2913.0 kJ: 2C2H6(g) + 7 O2(g)->4CO2(g) + 6 H2O(g) Based on this value and the standard enthalpies of formation for the other substances, the standard enthalpy of formation of H2O(g) is kJ/mol. 2. A scientist measures the standard enthalpy change for the following reaction to be -138.6 kJ : H2(g) + C2H4(g)->C2H6(g) Based on this value and the standard enthalpies of formation for the other substances, the...
A scientist measures the standard enthalpy change for the following reaction to be -2847.0 kJ: 2C2H6(g) + 7 02(g) —4CO2(g) + 6H2O(g) Based on this value and the standard enthalpies of formation for the other substances, the standard enthalpy of formation of CzH6(g) is kJ/mol. A scientist measures the standard enthalpy change for the following reaction to be -15.0 kJ : Ca(OH)2(aq) + 2 HCl(aq) +CaCl(s) + 2 H20(1) Based on this value and the standard enthalpies of formation for...
A scientist measures the standard enthalpy change for the following reaction to be -1064.8 kJ: 2H2S(g)3 O2(g> >2H2O(g) 2 S02(g) kJ/mol Based on this value and the standard enthalpies of formation for the other substances, the standard enthalpy of formation of S02(g) is A scientist measures the standard enthalpy change for the following reaction to be -138.6 kJ H2(g)C2H4(g) C2H6(g) Based on this value and the standard enthalpies of formation for the other substances, the standard enthalpy of formation of...
A scientist measures the standard enthalpy change for the following reaction to be 2752.8 kJ : 6CO2(g) + 6H2O(1) C6H12O6 + 6 O2(g) Based on this value and the standard enthalpies of formation for the other substances, the standard enthalpy of formation of CH1:05 is kJ/mol A scientist measures the standard enthalpy change for the following reaction to be 53.9 LJ: CO2(g) + H2(g)— CO(g) + H2O() Based on this value and the standard enthalpies of formation for the other...
Enthalpy of Formation Part 1: Part 2: Part 3: A scientist measures the standard enthalpy change for the following reaction to be 591.0 kJ : 2H2O(1)—>2H2(g) + O2(g) Based on this value and the standard enthalpies of formation for the other substances, the standard enthalpy of formation of H2O(l) is kJ/mol. A scientist measures the standard enthalpy change for the following reaction to be -2903.4 kJ: 2C2H6(g) + 7 O2(g)—>4CO2(g) + 6 H2O(g) Based on this value and the standard...
A.Using standard heats of formation, calculate the standard enthalpy change for the following reaction. N2(g) + 3H2(g) = 2NH3(g) B.Using standard heats of formation, calculate the standard enthalpy change for the following reaction. CaCO3(s) = CaO(s) + CO2(g) C. A scientist measures the standard enthalpy change for the following reaction to be -2910.6 kJ: 2C2H6(g) + 7 O2(g) = 4CO2(g) + 6 H2O(g) Based on this value and the standard enthalpies of formation for the other substances, the standard enthalpy...
A scientist measures the standard enthalpy change for the following reaction to be -559.7 kJ: H2CO(g) + O2(g) ----> CO2(g) + H2O(l) Based on this value and the standard enthalpies of formation for the other substances, the standard enthalpy of formation of H2CO(g) is ____kJ/mol.
A scientist measures the standard enthalpy change for the following reaction to be 236.4 kJ : CaCO3(s) ------> CaO(s) + CO2(g) Based on this value and the standard enthalpies of formation for the other substances, the standard enthalpy of formation of CaCO3(s) is _______ kJ/mol.
A scientist measures the standard enthalpy change for the following reaction to be 2853.6 kJ : 6CO2(g) + 6 H2O(l)C6H12O6 + 6 O2(g) Based on this value and the standard enthalpies of formation for the other substances, the standard enthalpy of formation of H2O(l) is ?kJ/mol.
A scientist measures the standard enthalpy change for the following reaction to be -1147.0 kJ : 2H2S(g) + 3 O2(g)----->2H2O(l) + 2 SO2(g) Based on this value and the standard enthalpies of formation for the other substances, the standard enthalpy of formation of H2O(l) is ____ kJ/mol.