A fuel-air mixture is placed in a cylinder fitted with a piston. The original vo

Question

A fuel-air mixture is placed in a cylinder fitted with a piston. The original volume is 0.245- When the mixture, gases are and 865 J or energy is released. To what volume will the gases expand against a constant pressure of635 mmHg, if all the energy released is converted to work to push the piston? A) 1.61 B) 7.38 C) 10.2 D) 9.97 E) 10.5 In which of the following does nitrogen have the highest oxidation state A) N_2O B) NaNO_2 C) NO_2 D) NH_ C E) HNO Consider reaction bet ethane (C_2H_5) and oxygen gas (O_2) to produce carbon dioxide and the water, as shown. What volume of carbon will be produced at STP from the reaction of 4.00 L of ethane with 7.00 L of oxygen? A) 6.00 L CO_2 C) 4.00 L CO_2 D) 2.00 L CO_2 E) 3.00 L CO_2

Explanation / Answer

11)  P (V2 - V1) = W = 865 J
635 mm Hg * ( V2 - 0.245L) = 865 J
V2 = 1.607 = 1.61 L approx , Option A)
14) Hrxn = nHof,products - nHof,reactants (n is the number of moles)
   Hrxn = [1*(-1125.5) + 1*(-135.1)] kJ/mol - [1*(-467.8)+1*(-814)]kJ/mol
   Hrxn = + 21.2 kJ
15) C2H5OH + 3O2 --------------> 2CO2 + 3H2O
According to the above reaction stoichiometry, 3 moles of O2 react with C2H5OH to give 2 moles
of 2 moles of CO2
1.26 * (2/3) = 0.84 mol of CO2   
   At STP 1 mole of gas occupies 22.4 lit volume of gas
   0.84 * 22.4 L = 18.816 L Option B)  

  

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