Energy that is associated with the motion of an object is called a). Kinetic ene

Question

Energy that is associated with the motion of an object is called a). Kinetic energy b). Thermal energy c). Potential energy d). Chemical energy What is the energy required to evaporate two moles of liquid water given the following equations? 2H_2(g) + O_2(g) rightarrow 2H_2O(g) Delta H = - 483.6 KJ 2H_2(g) + O_2(g) rightarrow 2 H_2O(l) Delta H = - 571.6 kJ. a). 44.0 kJ b). 88.0 kJ c). 5276 d). 1055.2 KJ e) -88.0 f). -44.0 What are the molecular geometries for C and N atoms? a) C=Tetrahedral, N=Bent b). C=Tetrahedral, N=Trigonal planar, c) C=Trigonal planar, N=Trigonal planar d). C=Trigonal planar, N=Bent e). C=Tetrahedral, N=Trigonal pyramidal Given thermochemical equation: 2NO_2(g) rightarrow 2NO(g) + O_2(g) Delta H = 114 KJ What is the Delta H the reaction NO(g) + 1/2 O_2(g) rightarrow NO_2(g)? a). -114 KJ b) -57 c). +57 KJ d). +114 KJ What are the bond angles for 1 and 2? (a) 120 degree, 120 degree b). 109.5 degree, smaller than 120 degree and bigger than 90 degree c). 109.5 degree, 109.5 degree d). 120 degree, smaller than 120 degree and bigger than 90 degree.

Explanation / Answer

1) The energy due to motion is KINETIC ENERGY.

2) Initially we should start with liquid water and finally left with water gas.

so reverse 2 nd reaction and add reaction-1 and 2

delta H= 571.6-483.6 == 88 kJ

4) To get required reacton, reverse the given reaction and divide with 2.

delta H = -114/2 = -57 kJ

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