Chemistry (OER)
2nd Edition
ISBN: 9781947172616
Author: OpenStax
Publisher: OpenStax College
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Textbook Question
Chapter 5, Problem 9E
If 14.5 kJ of heat were added to 485 g of liquid water, how much would its temperature increase?
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3.
An unknown element, X, combines with chlorine to give a substance with the formula
XC14. A chlorine analysis of the substance indicates that it contains 83.47% chlorine by mass.
What element is X and what is the formula of this compound?
(Hint: to identify an element or compound, identify its molar mass. Remember that Molar Mass
= (grams A)/(moles A). Solve for each individually and then divide them to find molar mass.)
1.
When hydrogen sulfide (H2S, MM = 34.08 g/mol) gas is bubbled into a solution of
sodium hydroxide (NaOH, 40.00 g/mol), sodium sulfide (Na2S, 78.04 g/mol) and water (18.02
g/mol) are produced according to the balanced chemical equation shown below?
H2S 2 NaOH --> Na2S 2 H₂O
(a) Assuming the reaction goes to completion, how many grams of sodium sulfide are formed if
2.50g of hydrogen sulfide is bubbled into a solution containing 1.85g of NaOH? (20 pts)
(b) Which reactant and how much of it remains after the reaction has been completed? (15 pts)
(c) If only 0.400g of sodium sulfide was recovered, what is the percent yield of this reaction (5
pts)
Chapter 5 Solutions
Chemistry (OER)
Ch. 5 - A burning match and a bonfire may have the same...Ch. 5 - Prepare a table identifying several energy...Ch. 5 - Explain the difference between heat capacity and...Ch. 5 - Calculate the heat capacity, in joules and in...Ch. 5 - Calculate the heat capacity, in joules and in...Ch. 5 - How much heat, in joules and in calories, must be...Ch. 5 - How much heat, in joules and in calories, is...Ch. 5 - How much would the temperature of 275 g of water...Ch. 5 - If 14.5 kJ of heat were added to 485 g of liquid...Ch. 5 - A piece of unknown substance weighs 44.7 g and...
Ch. 5 - A piece of unknown solid substance weighs 437.2 g,...Ch. 5 - An aluminum kettle weighs 1.05 kg. (a) What is the...Ch. 5 - Most people find waterbeds uncomfortable unless...Ch. 5 - A 500-mL bottle of water at room temperature and a...Ch. 5 - Would the amount of heat measured for the reaction...Ch. 5 - Would the amount of heat absorbed by the...Ch. 5 - Would the amount of heat absorbed by the...Ch. 5 - How many milliliters of water at 23 C with a...Ch. 5 - How much will the temperature of a cup (180 g) of...Ch. 5 - A 45-g aluminum spoon (specific heat 0.88 J/g C)...Ch. 5 - The temperature of the cooling water as it leaves...Ch. 5 - A 70.0-g piece of metal at 80.0 °C is placed in...Ch. 5 - If a reaction produces 1.506 kJ of heat, which is...Ch. 5 - A 0.500-g sample of KCl is added to 50.0 g of...Ch. 5 - Dissolving 3.0 g of CaCl2(s) in 150.0 g of water...Ch. 5 - When 50.0 g of 0.200 M NaCl(aq) at 24.1 C is added...Ch. 5 - The addition of 3.15 g of Ba(OH)28H2O to a...Ch. 5 - The reaction of 50 mL of acid and 50 mL of base...Ch. 5 - If the 3.21 g of NH4NO3 in Example 5.6 were...Ch. 5 - When 1.0 g of fructose, C6H12O6(s), a sugar...Ch. 5 - When a 0.740-g sample of trinitrotoluene (TNT),...Ch. 5 - One method of generating electricity is by burning...Ch. 5 - The amount of fat recommended for someone with a...Ch. 5 - A teaspoon of the carbohydrate sucrose (common...Ch. 5 - What is the maximum mass of carbohydrate in a 6-oz...Ch. 5 - A pint of premium ice cream can contain 1100...Ch. 5 - A serving of a breakfast cereal contains 3 g of...Ch. 5 - Which is the least expensive source of energy in...Ch. 5 - Explain how the heat measured in Example 5.5...Ch. 5 - Using the data in the check your learning section...Ch. 5 - Calculate the enthalpy of solution ( H for the...Ch. 5 - Calculate H for the reaction described by the...Ch. 5 - Calculate the enthalpy of solution ( H for the...Ch. 5 - Although the gas used in an oxyacetylene torch...Ch. 5 - How much heat is produced by burning 4.00 moles of...Ch. 5 - How much heat is produced by combustion of 125 g...Ch. 5 - How many moles of isooctane must be burned to...Ch. 5 - What mass of carbon monoxide must be burned to...Ch. 5 - When 2.50 g of methane burns in oxygen, 125 kJ of...Ch. 5 - How much heat is produced when loo mL of 0.250 M...Ch. 5 - A sample of 0.562 g of carbon is burned in oxygen...Ch. 5 - Before the introduction of chlorofluorocarbons,...Ch. 5 - Homes may be heated by pumping hot water through...Ch. 5 - Which of the enthalpies of combustion in Table 5.2...Ch. 5 - Does the standard enthalpy of formation of H2O(g)...Ch. 5 - Joseph Priestly prepared oxygen in 1774 by heating...Ch. 5 - How many kilojoules of heat will be released when...Ch. 5 - How many kilojoules of heat will be released when...Ch. 5 - The following sequence of reactions occurs in the...Ch. 5 - Both graphite and diamond burn....Ch. 5 - From the molar heats of formation in Appendix G,...Ch. 5 - Which produces more heat?...Ch. 5 - Calculate H298 for the process...Ch. 5 - Calculate H298 for the process...Ch. 5 - Calculate H for the process Hg2Cl2(s)2Hg(l)+Cl2(g)...Ch. 5 - Calculate H298 for the process...Ch. 5 - Calculate the standard molar enthalpy of formation...Ch. 5 - Using the data in Appendix G, calculate the...Ch. 5 - Using the data in Appendix G, calculate the...Ch. 5 - The following reactions can be used to prepare...Ch. 5 - The decomposition of hydrogen peroxide, H2O2, has...Ch. 5 - Calculate the enthalpy of combustion of propane,...Ch. 5 - Calculate the enthalpy of combustion of butane,...Ch. 5 - Both propane and butane are used as gaseous fuels....Ch. 5 - The white pigment TiO2 is prepared by the reaction...Ch. 5 - Water gas, a mixture of H2 and CO, is an important...Ch. 5 - In the early days of automobiles, illumination at...Ch. 5 - From the data in Table 5.2, determine which of the...Ch. 5 - The enthalpy of combustion of hard coal averages...Ch. 5 - Ethanol, C2H5OH, is used as a fuel for motor...Ch. 5 - Among the substances that react with oxygen and...Ch. 5 - How much heat is produced when 1.25 g of chromium...Ch. 5 - Ethylene, C2H2, a byproduct from the fractional...Ch. 5 - The oxidation of the sugar glucose, C6H12O6, is...Ch. 5 - Propane, C3H8, is a hydrocarbon that is commonly...Ch. 5 - During a recent winter month in Sheboygan,...
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