1 Answers
the molar enthalpy of combustion of ethanol (c2H5OH) is -1366.8kj/mol what is the enthalpy change when 10.00 grams of ethanol is combusted
n(C2H5OH)=m/M=10/46 = 0.2174 molH= (-1366.8)*0.2174 = -297.14 kJAnswer: -297.14 kJ
1 Answers 1 views
1) What is the relationship between gasoline and car? 2) How does gasoline work in a car?
1.Higher gasoline prices increased the demand for smaller, more-fuel-efficient vehicles relative to larger, less-efficient vehicles. That relationship continues to hold with recent vehicle sales, according to several current economic studies.2.A...
1 Answers 1 views
A reaction takes place at a constant pressure of 1.10atm with an internal energy change of 71.5kj and a volume decrease of 13.6L. What is the enthalpy change for the reaction? (1L•atm = 101.325J)
∆H = m x s x ∆T1.1 × 13.6 = 14.9614.96 × 101.325 = 1515.8221515.822 +71.5 = 1587.322J
1 Answers 1 views
Provide symbols (where appropriate) and definitions for the following terms:
(a) Enthalpy change
(b) Entropy change
(c) Free-energy change
(d) Spontaneity process
(e) Non-spontaneous process
(a) An enthalpy change, Delta;H, describes the change in enthalpy observed in the constituents of a thermodynamic system when undergoing a transformation or chemical reaction. It is the difference between...
1 Answers 1 views
Explain the following terms:
i) Integral enthalpy of solution
ii) Differential enthalpy of solution
iii) Enthalpy of dilution
I. Integral Enthalpy Of Solution is the heat absorbed or released when a solute is dissolved in a definite amount of solvent. The heat of solution depends on the nature...
1 Answers 1 views
the standard enthalpy of combustion of ethane, carbon, and hydrogen are -1559.7 kJ/mol, -393kJ/mol and -286kJ/mol respectively.
Use Hess'ss law to find the enthalpy of formation of ethane
ΔHform(C2H6)=ΔHcomb(C2H6)-(2ΔHcomb(C)+3ΔHcomb(H2))=-1559.7-(2(-393)+3(-286))=84,3 kJ/mol
1 Answers 1 views
Define enthalpy of combustion. Calculate the enthalpy of combustion of methanol if the enthalpies of formation of CO2,H20 andCH3OH are respectively .
-393.5kj/mol,-285.8kj/mol and -239.0kj/mol.
Answer: Enthalpy of combustion is the heat released during combustion of one mol amount of any substance by oxygen.You can calculate the combustion enthalpy of methanol using the enthalpy...
1 Answers 1 views
Assuming enthalpy of combustion of hydrogen at 273 K, –286 kJ and enthalpy of fusion of ice at the same temperature to be + 6.0 kJ, calculate enthalpy change during formation of 100 g of ice
Answer: H2 + 1/2O2 = H2O(l) ΔH (H2) =-286 kJ/mol ΔH H2O (s) = H2O(l) =6.0 kJ/mol n = m/M M (H2O) = 18 g/mol n (H2O) = 100 / 18...
1 Answers 1 views
What is the enthalpy change if 105 g of ethane is burned in a combustion reaction whose molar enthalpy of combustion is -1251 kJ/mol. *
n = m / MM (C2H6) = 30.07 g/moln (C2H6) = 105 / 30.07 = 3.5 moldelta H (C2H6) = - 1251 x 3.5 = -4367 kJ
1 Answers 1 views