Question 3 0.2 pts An unknown metal sample weighing 27.112 g at a temperature of

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Question 3 0.2 pts An unknown metal sample weighing 27.112 g at a temperature of 98 was placed in 52.141 g of water in a "coffee cup calorimeter" at 24°C. At equilibrium the temperature of the water and metal was 29°C (Show your work using the equation editor.) What was AT for the calorimeter? HTML Editor 0.7 pts Question 4 An unknown metal sample weighing 27.112 g at a temperature of 98 °C was placed in 52.141 g of water in a coffee cup calorimeter" at 24°C. At equilibrium the temperature of the water and meta was 29°C (Show your work using the equation editor, make sure to include your units.) Calculate qH20 using Eq.1 HTML Editor Question 5 0.7 pts An unknown metal sample weighing 27.112 g at a temperature of 98 °C was placed in 52.141 g of water in a coffee cup calorimeter" at 24°C. At equilibrium the temperature of the water and metal was 29°C (Show your work using the equation editor, make sure to include your units.) Using the specific heat of water. 4.18 J/g oC, calculate the specifc heat of the unknown metal sample using Eq. 3 Question6 0.2 pts When 4.102 g of KNO3 is dissolved in 39.825 g of water in a "coffee cup calorimeter" at 24°C the temperature of the solution went down to 19 °C. Is this solution reaction exothermic or endothermic? Why?

Explanation / Answer

Q3.

dT = Tfinal - Tinitial

dT = 29-24 = 5°C

Q4

Qwater = m*C*(Tf-Ti)

Qwater = 52.141*4.18*(5) = 1089.7469 J

Q5

Qmetal -1089.7469

Qmetal m*C*dT

C = 1089.7469 / (27.112) / (98-29) = 0.5825 J/gC

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