Chemistry Homework Help

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Calorimetry

Q. 0.15 g methane (CH4) is combusted in a bomb calorimeter that has a calorimeter constant of 5.00 kJ/ºC and the temperature rises from 15 ºC to 32 ºC, what is the ∆Hrxn?

Solved • May 1, 2020

Calorimetry

Q. What is the final temperature of a 50 g piece of copper that is at 125 ºC after it’s dropped into 25 mL of H2O that is at 22 ºC?

Solved • May 1, 2020

Calorimetry

Q. On a 5-day wilderness expedition, you'll need to heat 5.0 kg of water to the boiling point each day. The air temperature will average 25 °C. You have available canisters of compressed butane (C4H10) fuel, which you'll burn to heat the water. Each canister has 100. g of butane in it. What is the minimum number of fuel canisters you must bring?

Solved • Apr 29, 2020

Calorimetry

Q. 2.00g of Compound X with molecular formula C4h8 are burned in a constant-pressure calorimeter containing 35.00kg of water at 25°C. The temperature of the water is observed to rise by 0.6253°C. (You may assume all the heat released by the reaction is absorbed by the water, and none by the calorimeter itself.) Calculate the standard heat of formation of Compound X at 25°C.

Solved • Apr 29, 2020

Calorimetry

Q. 14.00 g of Compound X with molecular formula C4H6 are burned in a constant-pressure calorimeter containing 20.00 kg of water at 25°C. The temperature of the water is observed to rise by 7.614°C. (You may assume all the heat released by the reaction is absorbed by the water and none by the calorimeter itself). Calculate the standard heat of formation of Compound X at 25°C. Be sure your answer has a unit symbol, if necessary, and round it to the correct number of significant digits.

Solved • Apr 29, 2020

Calorimetry

Q. At a festival, spherical balloons with a radius of 210 cm are to be inflated with hot air and released. The air at the festival will have a temperature of 25C and must be heated to 100C to make the balloons float.

Solved • Apr 26, 2020

Calorimetry

Q. On a 7 day wilderness expedition you'll need to heat 5.0kg of water to the boiling point each day. The air temperature will average 25°C. You have available canisters of compressed propane C3H8 fuel, which you'll burn to heat the water. Each canister has 100.g of propane in it. What is the minimum number of fuel canisters you must bring? The standard heat of formation of propane at 25°C is −103.85/kJmol. You'll probably find other helpful data in the ALEKS Data resource.

Solved • Apr 26, 2020