A) When a 5.00 gsample of NaOH dissolves in 100.0 g of water in a âcoffeecupâ
calorimeter, thetemperature rises from 28.3 degrees C to 39.6 degrees C.
Calculate the heatenergy for the reaction of 5.00 g of NaOH AND the heatof
solution (reaction)for one mole of NaOH dissolving in water.
B) The reaction ofhydrochloric acid and sodium hydroxide is exothermic.
The equation is:HCl + NaOH NaCl + H
2OIn one experiment,a student placed 50.0 mL of 1.00 M HCl at 25.5 degrees C ona
coffee cupcalorimeter. To this was added 50.0 mL of 1.00 M NaOH solution alsoat
25.5 degrees C. Themixture was stirred, and the temperature quickly increased toa
maximum of 37.8degrees C. What is the heat of reaction in joules per mole ofHCl?
Because thesolutions are dilute, we can assume that their specific heats areclose to
that of water, 4.18J/g C, and that their densities are 1.00 g/mL. We can alsoassume
that no heat islost to the coffee cup itself or to the surrounding air.
C) A sample ofbenzene, C
6H6,weighing 3.51 g was burned in an excess of oxygenin a bombcalorimeter. The temperature of the calorimeter rose from 25.00to
37.18 degrees C. Ifthe heat capacity of the calorimeter and the contentswas
13.05 kJ/degree C,what is the value of
qfor burning 1 mol ofbenzene at constantvolume and 25.00degrees C?
A) When a 5.00 gsample of NaOH dissolves in 100.0 g of water in a âcoffeecupâ
calorimeter, thetemperature rises from 28.3 degrees C to 39.6 degrees C.
Calculate the heatenergy for the reaction of 5.00 g of NaOH AND the heatof
solution (reaction)for one mole of NaOH dissolving in water.
B) The reaction ofhydrochloric acid and sodium hydroxide is exothermic.
The equation is:HCl + NaOH NaCl + H
2OIn one experiment,a student placed 50.0 mL of 1.00 M HCl at 25.5 degrees C ona
coffee cupcalorimeter. To this was added 50.0 mL of 1.00 M NaOH solution alsoat
25.5 degrees C. Themixture was stirred, and the temperature quickly increased toa
maximum of 37.8degrees C. What is the heat of reaction in joules per mole ofHCl?
Because thesolutions are dilute, we can assume that their specific heats areclose to
that of water, 4.18J/g C, and that their densities are 1.00 g/mL. We can alsoassume
that no heat islost to the coffee cup itself or to the surrounding air.
C) A sample ofbenzene, C
6H6,weighing 3.51 g was burned in an excess of oxygenin a bombcalorimeter. The temperature of the calorimeter rose from 25.00to
37.18 degrees C. Ifthe heat capacity of the calorimeter and the contentswas
13.05 kJ/degree C,what is the value of
qfor burning 1 mol ofbenzene at constantvolume and 25.00degrees C?
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