Heat Calculation: Combustion of Ethyl Ether
a) What is qH2O?
What formula should be used to calculate qH2O when 5 milliliters of ethyl ether are burned in a bomb calorimeter?
b) What is qcal?
How do we calculate qcal in this scenario?
c) What is q for the combustion of 5.00 mL of ethyl ether?
How can we determine the heat produced during the combustion of 5.00 mL of ethyl ether?
d) What is q for the combustion of one mole of ethyl ether?
How do we find the heat generated when one mole of ethyl ether is combusted?
Answers:
a) To calculate qH2O, we use the formula q = mCΔT, where q is the heat, m is the mass, C is the specific heat capacity, and ΔT is the change in temperature.
b) Qcal can be calculated using the same formula as in part (a) but with the heat capacity of the calorimeter.
c) To determine q for the combustion of 5.00 mL of ethyl ether, we multiply the density by the volume to find the mass of ethyl ether burned. Then, we use the formula q = mCΔT with the given temperature change to find the heat.
d) For finding q for the combustion of one mole of ethyl ether, we need to use the balanced chemical equation for the combustion and the molar mass of ethyl ether. Calculate the moles of ethyl ether burned and use the formula q = nΔH to find the heat.
Heat Calculation in Combustion of Ethyl Ether
When 5 milliliters of ethyl ether (C4H10O) are burned in a bomb calorimeter, various heat calculations are necessary to determine the energy changes. Let's break down the steps to find qH2O, qcal, q for the combustion of 5.00 mL of ethyl ether, and q for the combustion of one mole of ethyl ether.
a) Calculation of qH2O: Use the formula q = mCΔT, where q is the heat, m is the mass (1.200 kg), C is the specific heat capacity (4.18 J/g·°C for water), and ΔT is the change in temperature (39.7°C - 23.5°C). Calculate the value by substituting the given values into the formula.
b) Determining qcal: Apply the same formula used for qH2O, but this time use the heat capacity of the calorimeter (5.32 J/°C) along with the temperature change. Calculate the heat produced in the calorimeter.
c) Finding q for the combustion of 5.00 mL of ethyl ether: Multiply the density of ethyl ether by the volume (5.00 mL)(0.714 g/mL) to obtain the mass burned. Then, utilize the heat formula with the given temperature change to determine the heat produced during the combustion process.
d) Calculating q for the combustion of one mole of ethyl ether: Refer to the balanced chemical equation for the combustion of ethyl ether and determine the molar mass of ethyl ether. Calculate the moles of ethyl ether burned and use the formula q = nΔH to find the heat generated when one mole of ethyl ether is combusted.