A chemical reaction has a ΔH of -2764 Kj. This indicates that the chemical reaction that took place was
2 answers:
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The reaction that took place was B) exothermic.
The equation for the ΔH is
To know if this reaction is exothermic or endothermic we will need to look at the sign of the ΔH. If it is positive, it means that enthalpy of the products is higher than the enthalpy of the reagents and the reaction is endothermic.
If the sign is negative, it means that the enthalpy of the products is lower than the enthalpy of the reagents and the reaction is exothermic. In this case, the sign is negative, so the reaction is exothermic.
Have a nice day!
The reaction that took place was B) exothermic.
The equation for the ΔH is
To know if this reaction is exothermic or endothermic we will need to look at the sign of the ΔH. If it is positive, it means that enthalpy of the products is higher than the enthalpy of the reagents and the reaction is endothermic.
If the sign is negative, it means that the enthalpy of the products is lower than the enthalpy of the reagents and the reaction is exothermic. In this case, the sign is negative, so the reaction is exothermic.
Have a nice day!
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Answer: (D) 0.025 mol
Explanation:
The given balanced equation is :
According to stoichiometry :
4 moles of ammonia reacts with = 5 moles of oxygen
Thus 0.30 moles of ammonia reacts with =
moles of oxygen
Now as given moles of oxygen are more than the required amount, oxygen is the excess reagent.
moles of oxygen left = 0.40 - 0.375 = 0.025
Thus 0.025 mol excess reagent remains.