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Chapter 5: Q45E (page 227)

How much heat is produced by burning 4.00 moles of acetylene under standard conditions?

Short Answer

Expert verified

The heat produced by burning 4 mol of acetylene under standard conditions is 5204.4 kJ.

Step by step solution

01

Reaction of acetylene with oxygen

Note that the enthalpy of combustion ofacetylene (鈭咹) = -1301.1 kJ/mol.

The equation representing the burning of 1mol of acetylene is:

C2H2(g) + O2 --> CO2(g) + H2O(l)

02

Calculation of heat

Enthalpy of combustion of acetylene is -1301.1 kJ/mol.

The heat produced by burning 1 mol of acetylene under standard conditions = -1301.1kJ/mol.

Therefore, the heat produced by burning 4mol of acetylene under standard conditions

= 4 脳 (-1301.1 kJ)

= -5204.4 kJ

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Most popular questions from this chapter

Question: An aluminum kettle weighs 1.05 kg.

(a) What is the heat capacity of the kettle?

(b) How much heat is required to increase the temperature of this kettle from 23.0 掳C to 99.0 掳C?

(c) How much heat is required to heat this kettle from 23.0 掳C to 99.0 掳C if it contains 1.25 L of water (density of 0.997 g/mL and specific heat of 4.184 J/g 掳C)?

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?

The reaction of 50ml of acid and 50ml of base described in example 5.5 increased the temperature of the solution by 6.9 degrees. How much would the temperature have increased if 100ml of acid and 100ml base had been used in the same calorimeter starting at the same temperature of 22藲C? Explain your answer.

A 0.500-g sample of KCl is added to 50.0 g of water in a calorimeter (Figure 5.12). If the temperature decreases by 1.05掳C, what is the approximate amount of heat involved in the dissolution of the KCl, assuming the heat capacity of the resulting solution is 4.18 J/g掳C? Is the reaction exothermic or endothermic?

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)
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