The following data was collected during the calorimetric run. Graph the data and

Question

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

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?

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

Explanation / Answer

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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