Chapter 5: Q35E (page 270)
What is the maximum mass of carbohydrates in a 6-oz serving of diet soda that contains less than 1 Calories per can if the average number of Calories for carbohydrates is 4.1 Calories/g?
The maximum mass of carbohydrates present in a 6-oz serving of diet soda is 0.24 g.
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Water gas, a mixture of \({{\bf{H}}_{\bf{2}}}\) and CO, is an important industrial fuel produced by the reaction of steam with red hot coke, essentially pure carbon:\({\bf{C}}\left( {\bf{s}} \right){\bf{ + }}{{\bf{H}}_{\bf{2}}}{\bf{O}}\left( {\bf{g}} \right) \to {\bf{CO}}\left( {\bf{g}} \right){\bf{ + }}{{\bf{H}}_{\bf{2}}}\left( {\bf{g}} \right)\).
(a) Assuming that coke has the same enthalpy of formation as graphite, calculate \({\bf{\Delta H}}_{{\bf{298}}}^{\bf{0}}\)for this reaction.
(b) Methanol, a liquid fuel that could possibly replace gasoline, can be prepared from water gas and additional hydrogen at high temperature and pressure in the presence of a suitable catalyst:\({\bf{2}}{{\bf{H}}_{\bf{2}}}\left( {\bf{g}} \right){\bf{ + CO}}\left( {\bf{g}} \right) \to {\bf{C}}{{\bf{H}}_{\bf{3}}}{\bf{OH}}\left( {\bf{g}} \right)\).
Under the conditions of the reaction, methanol forms as a gas. Calculate \({\bf{\Delta H}}_{{\bf{298}}}^{\bf{0}}\)for this reaction and for the condensation of gaseous methanol to liquid methanol.
(c) Calculate the heat of combustion of 1 mole of liquid methanol to H2O(g) and CO2(g).
When 1.0g of fructose, C6H12O6(s), a sugar commonly found in fruits, is burned in oxygen in a bomb calorimeter, the temperature of the calorimeter increases by 1.58หC. If the heat capacity of the contents is 9.90kJ/หC, what is q for this combustion?
Question 11: A piece of unknown solid substance weighs 437.2 g, and requires 8460 J to increase its temperature from 19.3 ยฐC to 68.9 ยฐC.
(a) What is the specific heat of the substance?
(b) If it is one of the substances found in Table 5.1, what is its likely identity?
When 1.42 g of iron reacts with 1.80 g of chlorine, 3.22 g of \({\bf{FeC}}{{\bf{l}}_{\bf{2}}}\)(s) and 8.60 kJ of heat is produced. What is the enthalpy change for the reaction when 1 mole of \({\bf{FeC}}{{\bf{l}}_{\bf{2}}}\)(s) is produced?
A serving of a breakfast cereal contains 3g of proteins, 18g of carbohydrates, and 6g of fat. What is the calorie content of a serving if the average number of calories for fat is 9.1 Calories/g, for carbohydrates is 4.1Calories/g, and for protein is 4.1Calories/g?
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