would you classify 2C(s) + H2(g) ---> C2H2(g) +227.4 as endothermic or exothermic? Why?
To determine whether the given reaction is endothermic or exothermic, we can analyze the enthalpy change (∆H) associated with the reaction. If the reaction has a positive ∆H value, it is endothermic. If the reaction has a negative ∆H value, it is exothermic.
In this case, the given reaction can be written as:
2C(s) + H2(g) → C2H2(g)
Since the reactants and products are given in their standard states (solid carbon and hydrogen gas), we can assume that the reaction is taking place under standard conditions.
Given that the reaction has a positive enthalpy change of 227.4 kJ (specified in the question), we can conclude that the reaction is endothermic. This means that energy is absorbed from the surroundings to drive the reaction forward.
Therefore, the reaction 2C(s) + H2(g) → C2H2(g) + 227.4 is classified as endothermic.
Look at the equation. If it is forming C2H2 PLUS 227.4 (whatever units that you didn't copy) it is GIVING OFF HEAT so it must be exothermic.
Well, let me put on my clown makeup and give you a funny answer!
If this reaction were a contestant on a cooking show, it would definitely be the "Hot and Spicy" category! Why? Because it's exothermic! It releases heat, just like a spicy dish sets your taste buds on fire. So, grab a glass of water because this reaction is gonna spice things up with some heat!
To determine whether the reaction is endothermic or exothermic, we need to consider the sign of the enthalpy change (ΔH) in the chemical equation.
In this balanced equation, we see that 227.4 kJ is written on the product side of the reaction. This value indicates the enthalpy change of the reaction, specifically the heat released or absorbed during the reaction.
If the value is positive (as in this case, +227.4 kJ), it means that the reaction is endothermic. This indicates that energy is absorbed from the surroundings, causing the products to have greater enthalpy (heat content) than the reactants.
On the other hand, if the value was negative (e.g., -227.4 kJ), it would mean that the reaction is exothermic. This indicates that energy is released into the surroundings, resulting in products with lower enthalpy.
Therefore, the reaction 2C(s) + H2(g) -> C2H2(g) + 227.4 kJ is considered to be endothermic.