1) What is the definition of the Enthalpy of Reaction? A) The amount of heat in
ID: 1004711 • Letter: 1
Question
1) What is the definition of the Enthalpy of Reaction?
A) The amount of heat in Joules require to evaporate 1 mole of reactant.
B) The amount of energy released from gaseous expansion during a reaction.
C)The amount of heat in kJ released (exothermic) or gained (andothermic) per mole of product.
2) Which of the following reactions needs to be reversed to solve for the Heat of Neutralization between Hydrochloric Acid and Ammonia?
A)Acetic Acid + Ammonia.
B)Hydrochloric Acid + Sodium Hydroxide.
C)Acetic Acid + Sodium Hydroxide.
3) What is the molar heat of neutralization (Enthalpy of Reaction) in kJ/mol if 5 moles of HA neutralized 5 moles of BOH and released 15207 J of heat?
4) Calculate the molar heat of neutralization in kJ/mol of the reaction between HA and BOH given the following information:
The temperature change equals 10C,
50 mL of 1 M concentration of Acid
50 mL of 1 M concentration of Base
Heat capacity of the calorimeter is 6.5 J/C.
Remember that the specific heat of water is 4.18 J/gC
5) How much heat is gained (in Joules) by the water where a chemical reaction takes place in 100 mL aqueous solution and has a temperature increase of 10 C?
Explanation / Answer
1)
c) The amount of heat in kJ released (exothermic) or gained (endothermic) per mole of product.
enthalpy of reaction is the heat released or absorbed when 1 mole of a reactant reacts
2) B)Hydrochloric Acid + Sodium Hydroxide.
the reaction between HCl and NH3 is actually reaction between H+ and OH- because these are the ionic species combining whcih is same as HCl and NaOH where also H+ and OH- is combining
3) 15207/5 = 3041 J/mol
4) Q = m x dT x S
= 100 x 10 x 4.18 = 4180 J + 6.5 x 10 = 4245 J for 0.05 moles of acid so for 1 mole it is 84900 J/mol
5) Q = m x dT x S
= 100 x 10 x 4.18 = 4180 J
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