1.A metal initially at 450. ° C and mass 2.00 g is dropped into a liquid with sp
ID: 918898 • Letter: 1
Question
1.A metal initially at 450. ° C and mass 2.00 g is dropped into a liquid with specific heat capacity 4.00 Jg-1 ° C-1, mass 10.0 g and initial temperature 40.0 ° C. The final temperature of the liquid is 50.0 ° C. What is the specific heat capacity of the metal. Express your answer in Jg-1 ° C-1.
2. The enthalpy of combustion of ethane gas, C2H6(g), is about -1.5*103 kJ/mol. When ethane reacts with O2(g), the products are carbon dioxide CO2(g) and water H2O(l). How much heat is released during the combustion of ethane gas when 14 mols of O2(g) are consumed. Express your answer in kJ.
Explanation / Answer
1.A metal initially at 450. ° C and mass 2.00 g is dropped into a liquid with specific heat capacity 4.00 Jg-1 ° C-1, mass 10.0 g and initial temperature 40.0 ° C. The final temperature of the liquid is 50.0 ° C. What is the specific heat capacity of the metal. Express your answer in Jg-1 ° C-1.
Ql = m*Cp*(Tf-Tl)
Ql = 10*4*(50-40) = 400
Then
Q = m*Cp*(Tf-Tm)
-400 = 2*Cp*(50-450)
Cp = (400/2/400) = 0.5 J/gC
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