What is expected when the reaction shown below takes place in a thermally-insula

Question

What is expected when the reaction shown below takes place in a thermally-insulated container outfitted with a movable piston at a constant atmospheric pressure of 1 atm? 2 C_2H6(g) + 7 O_2(g) rightarrow 4 CO_2 (g) + 6 H_2O(g) Volume will decrease and work will be done by the system. Volume will decrease and work will be done on the system. Volume will increase and work will be done by the system. Volume will increase and work will be done on the system. Within a given shell of a multielectron atom, the lower l for an orbital, the higher the orbital energy and the higher Z_eff for the electron. higher the orbital energy and the lower Z_eff for the electron. lower the orbital energy and the higher Z_eff for the electron. lower the orbital energy and the lower Z_eff for the electron. Elements that can accommodate more than eight electrons in their valence shell occur only in periodic table period 2 or lower. 3 or lower. 4 or lower. 5 or lower. At constant pressure, the combustion of 5.00 g of C_2H_6(g) releases 259 kJ of heat What is Delta H for the reaction given below? 2C_2H_6(g) + 7 O_2(g) rightarrow 4 CO_2(g) + 6 H_2O(l) -43.2 kJ -779 kJ -1560 kJ -3120 kJ What are the signs of Delta H, Delta S, and Delta G for the following spontaneous change? Delta H = + Delta S = + Delta G = - Delta H = + Delta S = - Delta G = - Delta H = - Delta S = - Delta G = - Delta H = - Delta S = + Delta G = -

Explanation / Answer

18) answer is C, because the no.of moles of reactants are less(9) than the no. of moles of products (10). This means there is volume expansion. So work done by the system in terms of expansion.

19) answer is C, As the 'l' value increases the energy increases and Zeff decreases.

20) answer is B, 1st and 2ndperiod elements can accommodate only 8 electrons maximum, not more than that. 3rd and lower period elements has the suuficient orbitals to accommodate more than 8 electrons.

21) answer is D, According to the given data, 5.0 gr of ethane produce 259 KJ of heat. This mass equals to 0.166 moles. So,

0.166 moles ---------------> 284 KJ

2 moles -----------------> ?

The amount of heat released in the above reaction is 3120.4 KJ. The delta H = - 3120.4 KJ

22) answer is D, For spontaneous reactions the change in enthalpy is -ve, change in entropy is +ve. Therefore the change in gibbs free energy is -ve. (delta G = delta H - T * delta S)

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