14 May HOW MUCH HEAT CAN BE ABSORBED BY 1.00 KG OF WATER AND HAVE THE TEMPERATURE OF THE WATER INCREASE BY ONLY 1.00 °C?
How much heat can be absorbed by 1.00 kg of water and have the temperature of the water
increase by only 1.00 °C?
2. A piece of cobalt (cp = 0.46 J/g⋅°C) originally at 98.6 °C is placed into a coffee cup calorimeter
containing 200.0 grams of water at 26.5 °C. The final temperature of the water is 39.5
degrees Celsius. What was the mass of the piece of cobalt?
3. A Chemistry 1A student drops 65.0 grams of copper (cp = 0.385 J/g⋅°C) with an original
temperature of 95.4 °C into a coffee cup calorimeter containing 100.0 grams of water. The
water in the calorimeter is initially at 23.5 °C before the copper is added. Assuming no heat is
lost to the environment, what will be the final temperature of the water?
4. Calculate the amount of heat that can be generated from the reaction between 1.250 grams
of sodium hydroxide and 55.00 mL of 1.000M HCl.
NaOH(s) + HCl(aq) → H2O(l) + NaCl(aq) ΔH = -100.01 kJ
5. A series of experiments were set up to test the affect of a limiting reactant on the production
of energy. A student prepared three mixtures of hydrogen and oxygen. Each mixture was
ignited and reacted to completion according to the reaction shown below.
a. The first mixture contained 1.000 moles of hydrogen and 1.000 moles of oxygen.
Calculate q for this reaction.
b. The second mixture contained 2.000 moles of hydrogen and 1.000 moles of oxygen.
Calculate q for this reaction.
c. The third mixture contained 3.000 moles of hydrogen and 1.000 moles of oxygen.
Calculate q for this reaction.
2 H2(g) + O2(g) → 2 H2O(l) ΔH = -571.66 kJ
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