A piece of metal weighing 3.20 grams is heated to 100. °C. It is dropped into 50.0 grams of water in a calorimeter at 22.5 °C. When no further change is observed, the temperature of the water and the metal rod is 26.5 °C. Ignoring any heat lost or gained by the calorimeter, what is the metal and its specific heat?
Question 1 )
A) A piece of metal weighing 3.20 grams is heated to 100. °C. It is dropped into 50.0 grams of water in a calorimeter at 22.5 °C. When no further change is observed, the temperature of the water and the metal rod is 26.5 °C. Ignoring any heat lost or gained by the calorimeter, what is the metal and its specific heat?
B)Calculate the amount of heat needed to change 45.0 grams of ice at -25.0 °C to steam at 250.0 °C. (For water, ΔHfus = 333 J/g;ΔHvap = 2260 J/g; Specific Heat (ice) = 2.10 J g-1 K-1; Specific Heat (steam) = 2.00 J g-1 K-1)
c) Which of the following equations represents a ΔH°f equation?
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CO2(g) + H2(g) → HCOOH(l)
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CO(g) + H2O(l) → HCOOH(l)
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2 C(s) + 2 H2(g) + 2 O2(g) → 2 HCOOH(l)
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C(s) + H2O(l) + 1/2 O2(g) → HCOOH(l)
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C(s) + H2(g) + O2(g) → HCOOH(l)
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