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"How much heat is evolved" Thermochemistry Question
This is a question from a general chemistry I quiz i had a few days ago. I got this question, and all other questions like it correct, but here's the thing.
Calcium oxide and water react in an exothermic reaction:
CaO(s) + H2O(l) → Ca(OH)2(s) DHrxn° = −64.8 kJ/mol
How much heat would be liberated when 7.15 g CaO(s) is dropped into a beaker containing 152 g H2O?
We have an exam tomorrow and I've been studying the majority of the weekend and I just started working on a thermochemistry worksheet that our instructor was kind enough to provide for us, and for every single "how much heat is evolved" or "how much heat would be released" question has an answer of negative _____.
The answer to this question would be positive, right? Because the negative enthalpy says that heat is released, and heat released = heat evolved = heat produced.
I think he's just trying to stress the concept of enthalpy but if this is the case i think he is definitely going about it in the wrong way > <
(PS: If i was allowed to see the answer that i recorded, this post would not be necessary, sorry)
Your Friend,
Anonymous
This is a question from a general chemistry I quiz i had a few days ago. I got this question, and all other questions like it correct, but here's the thing.
Calcium oxide and water react in an exothermic reaction:
CaO(s) + H2O(l) → Ca(OH)2(s) DHrxn° = −64.8 kJ/mol
How much heat would be liberated when 7.15 g CaO(s) is dropped into a beaker containing 152 g H2O?
We have an exam tomorrow and I've been studying the majority of the weekend and I just started working on a thermochemistry worksheet that our instructor was kind enough to provide for us, and for every single "how much heat is evolved" or "how much heat would be released" question has an answer of negative _____.
The answer to this question would be positive, right? Because the negative enthalpy says that heat is released, and heat released = heat evolved = heat produced.
I think he's just trying to stress the concept of enthalpy but if this is the case i think he is definitely going about it in the wrong way > <
(PS: If i was allowed to see the answer that i recorded, this post would not be necessary, sorry)
Your Friend,
Anonymous