The following data was collected during the calorimetric run. Graph the data and answer the questions below. (Enter your answers to three significant figures.)
Table 1: Time and Temperature Data
| Time (s) | Temperature (°C) |
|---|---|
| −60. | 23.6 |
| −30. | 23.6 |
| 30. | 14.2 |
| 60. | 15.5 |
| 90. | 16.2 |
| 120. | 16.8 |
| 150. | 17.2 |
| 180. | 17.6 |
| 210. | 17.9 |
| 240. | 18.1 |
| 270. | 18.3 |
| 300. | 18.5 |
| 330. | 18.7 |
| 360. | 18.9 |
| 390. | 19.0 |
| 420. | 19.2 |
| 450. | 19.3 |
| 480. | 19.4 |
| 510. | 19.5 |
| 540. | 19.7 |
| 570. | 19.8 |
| 600. | 19.9 |
What is the initial temperature based on the calorimetric
run?
23.6 °C (got it correct)
What is the final temperature based on the calorimetric run?
19.9 °C (incorrect :( )
If the total mass of the solution was 35.5 g and the heat capacity
of the solution is the same as water (4.1801 J/g·°C), what is the
value of q for the run?
207.75 J (incorrect)
What is the value of q for the reaction?
549.06 J (incorrect)
Is the reaction endothermic or exothermic?
What is the initial temperature based on the
calorimetric run?
23.6 °C (got it correct) clearly, since it is the first Tempoeratur
assigned
What is the final temperature based on the calorimetric run?
19.9 °C (incorrect :( ) --> Final temperature, is assigned as
"T.min" or minimumtemperature value, so
14.2°C
If the total mass of the solution was 35.5 g and the heat capacity
of the solution is the same as water (4.1801 J/g·°C), what is the
value of q for the run?
207.75 J (incorrect)
Q = m*C*(Tf-Ti)
Q = (35.5)(4.1801)(14.2-23.6)
Q = -1394.89 J
What is the value of q for the reaction?
549.06 J (incorrect)
Qrxn = -Qsolution
QRxn - (-1394.89) = 1394.89 J
Is the reaction endothermic or exothermic?
This must be endothermic, since the reaciton is absorbing heat from environment
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