For which of reactions shown below expansion work done by the system? 2SO_2(g) +

Question

For which of reactions shown below expansion work done by the system? 2SO_2(g) + O_2(g) rightarrow 2 SO_3(g) C_3H_8(g) + 5 O_2(g) rightarrow 3O_3(g) + 4 H_2O(g) H_2(g) + Cl_2(g) rightarrow 2 HCl(g) 2 NO_2(g) rightarrow N_2O_4(g) What is w in kJ for the expansion of gas from 15.L to 35. L against a constant external pressure of 1.5 atm? (1 L atm = 101 J) -5.3 kJ -3.0 kJ 3.0 kJ 5.3 kJ What is pressure (in mm Hg) of the gas inside the following apparatus if the outside pressure, P_atm, is 737 mm Hg and the difference in mercury levels Delta ln is 19 mm Hg? 18 mm Hg 718 mm Hg 756 mm Hg 737 mm Hg When 2.09 g of CaO is added to 100.0 g of water in a calorimeter, the temperature rises from 25.0 degree C to 32.3 degree C. Calculate Delta H (in kilojoules) for the reaction. specific heat of water is 4.18 J/(g. degree C)) CaO(s) + H_2O(l) rightarrow = Ca(OH)_2(aq) Delta H is. 3.05 kJ 61.0 kJ 30.5 kJ 6.37 kJ

Explanation / Answer

Ans 14. B) C3H8 (g) + 5O2(g) ---> 3CO2(g) + 4H2O(g)

This is the combustion reaction of propane that utilises one mole of propane and 5 moles of oxygen gas to form 3 moles of carbon dioxide gas and 4 moles water vapour.

So you see 6 moles of reactants in total give 7 moles of the product , so basically the volume of system is increases and hence expansion will occur .

In rest all other reactions either the volume has been decreased on the product side or has not changed at all.

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