How much energy is required to decompose 765 g of PCI_3, according to the reacti

Question

How much energy is required to decompose 765 g of PCI_3, according to the reaction below? The molar mass of PCI3 is 137.32 g/mol and may be useful. Use the standard reaction enthalpies given below to determine DeltaHdegree_rXn for the following reaction: At constant pressure, the combustion of 15.00 g of C_2H_6(g) releases 777.0 kJ of heat. What is DeltaH for the reaction given below? 2 C_2H_6(g) + 7O_2(g) rightarrow 4 CO_2(g) + 6 H_2O(1) Which of the following visible colors of light has the highest frequency? For n = 3, what are the possible sublevels? Describe the shape of a p orbital. A) spherical B) dumbbell shaped C) three balls D) four balls E) eight balls

Explanation / Answer

1. Energy required.

765gPCl3 *(1mol PCl3/137.32 g ) *(1207kJ/4molPCl3)= 1681.027 kJ

2. Rewrite the RXNs

([PCl3 + Cl2 -> PCl5] H = -157KJ)*4

P4 + 6Cl2 -> 4PCl3 H = -1207KJ

P4 + 10 Cl2 -> 4 PCl5 H = -1835KJ

4. Blue

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