1.)Which of the following processes will result in the lowest final temperature
ID: 1016151 • Letter: 1
Question
1.)Which of the following processes will result in the lowest final temperature of the metal–water mixture at equilibrium?
the addition of 100 g of cobalt (s = 0.418 J/(g • °C)) at 95°C to 100 mL of water at 25°C in an insulated container
the addition of 100 g of chromium (s = 0.447 J/(g • °C)) at 95°C to 100 mL of water at 25°C in an insulated container
the addition of 100 g of silver (s = 0.237 J/(g • °C)) at 95°C to 100 mL of water at 25°C in an insulated container
the addition of 100 g of gold (s = 0.129 J/(g • °C)) at 95°C to 100 mL of water at 25°C in an insulated container
the addition of 100 g of copper (s = 0.385 J/(g • °C)) at 95°C to 100 mL of water at 25°C in an insulated container
2.)Which of the following has a standard enthalpy of formation value of zero at 25°C?
the addition of 100 g of cobalt (s = 0.418 J/(g • °C)) at 95°C to 100 mL of water at 25°C in an insulated container
the addition of 100 g of chromium (s = 0.447 J/(g • °C)) at 95°C to 100 mL of water at 25°C in an insulated container
the addition of 100 g of silver (s = 0.237 J/(g • °C)) at 95°C to 100 mL of water at 25°C in an insulated container
the addition of 100 g of gold (s = 0.129 J/(g • °C)) at 95°C to 100 mL of water at 25°C in an insulated container
the addition of 100 g of copper (s = 0.385 J/(g • °C)) at 95°C to 100 mL of water at 25°C in an insulated container
Explanation / Answer
Q = M.S.delta T
all the metals are 100 g starting at 95 C and all the water 100 g at 25 C. The lowest temp will result from the least energy transferred to the water from the metal. This will be for the metal with the smallest specific heat which is gold.
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