Question

A coffee-cup calorimeter contains an aqueous solution of A, initially at 31.5 °C. Then, 0.766 mol B is added to the solution where it reacts according to the reaction shown below, after which the temperature was found to be 23.5 °C. The total mass of the entire solution is 114.7 g. 7 A (aq) + 8 B (aq) --> 9 C (aq) + D (aq) The specific heat capacity of the whole solution is 4.184 J/(g·°C). What is the heat of reaction in kilojoules per mole of B?

Name: a coffee cup calorimeter contains an aqueous solution of a initially at 315 c then 0766 mol b is added to the solution where it reacts according to the reaction shown below after which the t 70887
Uploaded: 2023-09-19T17:47:41-08:00
Duration: 2 min 5 s
Channel: Angela Williamson
Description: a coffee cup calorimeter contains an aqueous solution of a initially at 315 c then 0766 mol b is added to the solution where it reacts according to the reaction shown below after which the t 70887

          A coffee-cup calorimeter contains an aqueous solution of A,
initially at 31.5 °C.  Then, 0.766 mol B is added to the
solution where it reacts according to the reaction shown below,
after which the temperature was found to be 23.5 °C.  The
total mass of the entire solution is 114.7 g.
7 A (aq)  +  8 B (aq) -->  9
C (aq)  +  D (aq)
The specific heat capacity of the whole solution is 4.184
J/(g·°C).
What is the heat of reaction in kilojoules
per mole of B?

Added by Lisa S.

Chemistry: Structure and Properties

Nivaldo Tro 2nd Edition

Instant Answer

Solved by Expert Angela Williamson

09/19/2023

Step 1

We can use the formula: q = mCΔT where q is the heat absorbed or released, m is the mass of the solution, C is the specific heat capacity of the solution, and ΔT is the change in temperature. In this case, we have: m = 114.7 g C = 4.184 J/(g·°C) ΔT = 31.5 °C Show more…

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A coffee-cup calorimeter contains an aqueous solution of A, initially at 31.5 °C. Then, 0.766 mol B is added to the solution where it reacts according to the reaction shown below, after which the temperature was found to be 23.5 °C. The total mass of the entire solution is 114.7 g. 7 A (aq) + 8 B (aq) --> 9 C (aq) + D (aq) The specific heat capacity of the whole solution is 4.184 J/(g·°C). What is the heat of reaction in kilojoules per mole of B?