A 4.000 g sample of methanol, CH3OH, was combusted in the presence of excess oxygen in a bomb calorimeter containing 4.0
Posted: Sat Jul 09, 2022 12:30 pm
A 4.000 g sample of methanol, CH3OH, was combusted inthe presence of excess oxygen in a bomb calorimeter containing4.000 x 103 g of water. The temperature of thewater increased from 23.00 °C to 29.76°C. The heat capacity ofthe calorimeter was 2657 J/°C. The specific heat ofwater is 4.184 J/g°C. How much heat, in kJ, was produced by thecombustion of the methanol sample? (Requires at least 4 steps ofcalculations.)
-131 kJ
-112 kJ
-314 kJ
-489 kJ
2. A chemical reaction took place in a 6-liter cylindricalenclosure fitted with a piston (like the cylinder in an internalcombustion engine). Over the time required for the reaction to becomplete, the system underwent a volume change from 3.20 liters to0.50 liters. Which statement below is true?
Expansion occurred; work was performed by the system.
Compression occurred; work was performed on the system.
Heat was absorbed.
Heat was released.
-131 kJ
-112 kJ
-314 kJ
-489 kJ
2. A chemical reaction took place in a 6-liter cylindricalenclosure fitted with a piston (like the cylinder in an internalcombustion engine). Over the time required for the reaction to becomplete, the system underwent a volume change from 3.20 liters to0.50 liters. Which statement below is true?
Expansion occurred; work was performed by the system.
Compression occurred; work was performed on the system.
Heat was absorbed.
Heat was released.