Answer both questions with explanation plz: a) A piece of iron (specific heat ca

Question

Answer both questions with explanation plz:

a) A piece of iron (specific heat capacity = 0.452 J·g–1 ·C–1 ) with a mass of 54.3218 g is heated in a water bath until it reaches a temperature of 98.2 C. The iron is then transferred into a calorimeter (Styrofoam cups) that contains 68.5314 g of water initially at 22.1 C. The final temperature of the entire system is 27.5 C. The specific heat capacity of water is 4.184 J·g–1 ·C–1 . Determine the value of the calorimeter constant.

b) When 60.0 mL of a 0.400 M solution of HNO3 is combined with 60.0 mL of a 0.400 M solution of NaOH in the calorimeter described in question #1, the final temperature of the solution is measured to be 26.6 C. The initial temperature of the solutions is 24.0 C. Assuming the specific heat capacity of the final solution is 3.90 J·g–1 ·C–1 and the density of the final solution is 1.04 g/mL, calculate qrxn.

HNO3(aq) + NaOH(aq) H2O(l) + NaNO3(aq)

Explanation / Answer

Ccal= -(m iron *Cs *change in temp iron) / change in temp - m H2O *Cs

Ccal= -(54.3218 g * 0.452 J/g degrees C * 5.4 degrees C) / 5.4 degrees C - 68.5314 g * 4.184 J/g degrees C

Ccal= -24.55 J degrees C - 286.74 J degrees C

Ccal= 262.19 J/ degrees C

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