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Chapter 5: Question 15 E (page 269)

Would the amount of heat measured for the reaction in example 5.5be greater, lesser, or remain the same if we used a calorimeter that was a poorer insulator than a coffee cup calorimeter? Explain your answer.

Short Answer

Expert verified

The amount of heat measured would be lesser if the calorimeter was replaced with a poorly insulated calorimeter.

Step by step solution

01

Change in temperature

The amount of heat measured inexample 5.5 is 2.89kJ.

If the calorimeter is poorly insulated, it will lose heat to its surroundings, decreasing the overall temperature of the reaction.Therefore, the change in temperature would also decrease.

02

Heat measured

The heat required to raise the temperature of a substance is given by the formula Q = C\( \times \)m\( \times \)\(\Delta \)T, where鈥淐鈥� is thespecific heat of the substance, 鈥渕鈥� is the mass of the substance, and 鈥溾垎T鈥� is the change in the temperature of the substance.

Suppose the change in temperature decreases, and the heat measured for the reaction would also decrease. So, the heat measured for the reaction in example 5.5 would be less than 2.89kJ.

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Most popular questions from this chapter

When 0.963 g of glucose, C6H6, is burned in a bomb calorimeter, the temperature of the calorimeter increases by 8.39掳C. The bomb has a heat capacity of 784 J/掳C and is submerged in 925 mL of water. How much heat was produced by the combustion of the glucose sample?

A sample of 0.562 g of carbon is burned in oxygen in a bomb calorimeter, producing carbon dioxide. Assume both the reactants and products are under standard state conditions, and that the heat released is directly proportional to the enthalpy of combustion of graphite. The temperature of the calorimeter increases from 26.74 掳C to 27.93 掳C. What is the heat capacity of the calorimeter and its contents?

Calculate the enthalpy of combustion of butane, C4H10(g) for the formation of H2O(g) and CO2(g). The enthalpy of formation of butane is -126 kJ/mol.

Write the heat of formation reaction equations for:

(a) \({{\bf{C}}_{\bf{2}}}{{\bf{H}}_{\bf{5}}}{\bf{O}}{{\bf{C}}_{\bf{2}}}{{\bf{H}}_{\bf{5}}}\)(l)

(b) \({\bf{N}}{{\bf{a}}_{\bf{2}}}{\bf{C}}{{\bf{O}}_{\bf{3}}}\)(s)

How many kilojoules of heat will be released when exactly 1 mole of manganese, Mn, is burned to form Mn3O4(s) at standard state conditions?
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