Answer:
A is an endothermic reaction.
Explanation:
When energy of breaking bonds is greater than the energy released during making of bonds, we need to supply energy to the reaction and thus the reaction is called as endothermic reaction. We can also say that the enthalpy of formation of products is more than the enthalpy of formation of reactants making overall enthalpy change to be positive.
While in case B, the energy to break bond is less than the energy released during making of bonds. thus there is overall released of energy during the reaction and hence it is exothermic reaction.
<span>Phosphorus is about 0.099% in the Earth's crust. Among the elements in Group 15 in the periodic table, it is the most abundant. Also, it is the most dispersed element in nature. However, it does not occur as a free element. It occurs as a compound.</span>
A) 4400 kj of heat released into surroundings
<h3>Further explanation</h3>
Reaction
C3H8(g) + 5 O2(g) → 3 CO2(g) + 4 H2O, the ∆H is –2200 kJ
Reaction exothermic( ∆H=-, released heat to surrounding) and for combustion of 1 mole of C3H8
So for two moles of C3H8, the enthalpy :
This statment is false, the pen on a seismograph does not swing freely.
