Concept explainers
(a)
Interpretation:
The standard reaction enthalpy for following reaction has to be calculated.
Concept Introduction:
Enthalpy is the amount energy absorbed or released in a process.
The value of standard enthalpy change
(a)
Answer to Problem 101QRT
The standard reaction enthalpy of given reaction is
Explanation of Solution
Given:
Using the above given reaction enthalpy is calculated by subtracting the summation of formation of products from the summation of formation enthalpy of reactants.
(b)
Interpretation:
The amount of heat transferred when eight kilogram of ammonium nitrate explodes has to be calculated.
(b)
Answer to Problem 101QRT
The amount of heat energy evolved is
Explanation of Solution
The minus sign in reaction enthalpy change value shows that heat is evolved in the given reaction.
Molar mass of
The amount of heat transferred when eight kilograms of
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Chapter 4 Solutions
EBK CHEMISTRY: THE MOLECULAR SCIENCE
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- The Romans used calcium oxide, CaO, to produce a strong mortar to build stone structures. Calcium oxide was mixed with water to give Ca(OH)2, which reacted slowly with CO2 in the air to give CaCO3. Ca(OH)2(s) + CO2(g) CaCO3(s) + H2O(g) (a) Calculate the standard enthalpy change for this reaction. (b) How much energy is evolved or absorbed as heat if 1.00 kg of Ca(OH)2 reacts with a stoichiometric amount of CO2?arrow_forwardA 10.00-g sample of acetic acid, HC2H3O2, was burned in a bomb calorimeter in an excess of oxygen. HC2H3O2(l)+2O2(g)2CO2(g)+2H2O(l) The temperature of the calorimeter rose from 25.00C to 35.84C. If the heat capacity of the calorimeter and its contents is 13.43 kJ/C, what is the enthalpy change for the reaction?arrow_forwardA sample of sucrose, C12H22O11, is contaminated by sodium chloride. When the contaminated sample is burned in a bomb calorimeter, sodium chloride does not burn. What is the percentage of sucrose in the sample if a temperature increase of 1.67C is observed when 3.000 g of the sample are burned in the calorimeter? Sucrose gives off 5.64103kJ/mol when burned. The heat capacity of the calorimeter and water is 22.51 kJ/C.arrow_forward
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- The temperature of the cooling water as it leaves the hot engine of an automobile is 240 F. After it passes through the radiator it has a temperature of 175 F. Calculate the amount of heat transferred from the engine to the surroundings by one gallon of water with a specific heat of 4.184 J/g oC.arrow_forwardExplain the difference between heat capacity and specific heat of a substance.arrow_forwardWhen calcium carbonate, CaCO3 (the major constituent of limestone and seashells), is heated, it decomposes to calcium oxide (quicklime). CaCO3(s)CaO(s)+CO2(g);H=177.9kJ How much heat is required to decompose 21.3 g of calcium carbonate?arrow_forward
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