Chemistry
4th Edition
ISBN: 9780078021527
Author: Julia Burdge
Publisher: McGraw-Hill Education
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Chapter 5.7, Problem 1PPC
Interpretation Introduction
Interpretation:
The enthalpy change of the reaction is to be calculated.
Concept introduction:
The change in the enthalpy of a reaction when reactants are converted to products is the same, whether the reaction takes place in one step or in many steps. This law is known as Hess’s law.
On adding the thermochemical equations, the enthalpy change value is also added, which gives the enthalpy change of the net reaction.
On reversing any equation, the sign of enthalpy change value is changed to the opposite sign.
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A scientist measures the standard enthalpy change for the following reaction to be -201.7 kJ :
CO(g) + 3 H2(g) CH4(g) + H20(g)
Based on this value and the standard enthalpies of formation for the other substances, the standard enthalpy of formation of CO(g) is
kJ/mol.
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Barium carbonate, as many other metal carbonates, decomposes at heating producing barium oxide and carbon dioxide gas. If standard enthalpy ΔHorxn of barium carbonate decompostion is 269.3 kJ/mol, how many kilojoules of energy are required to decompose 10.0 g of barium carbonate?
(a) 27.28 (b) 13.64 (c) 7.82 (d) 40.92 (e) none of those. If so, what is you answer?
Part A) Barium carbonate, as many other metal carbonates, decomposes at heating producing barium oxide and carbon dioxide gas. If standard enthalpy ΔHorxn of barium carbonate decompostion is 269.3 kJ/mol, how many kilojoules of energy are required to decompose 10.0 g of barium carbonate?
(a) 27.28 (b) 13.64 (c) 7.82 (d) 40.92 (e) none of those. If so, what is you answer?
Part B) Sodium hydroxide in the amount of 10.0 g is allowed to react with 1.12 L of carbon dioxide gas at STP 2NaOH(s) + CO2(g) => Na2CO3(s) + H2O(g)and the product dried out to permanent weight.What will be the mass of the product?
(a) 12.7 g (b) 11.2 g (c) 13.3 g (d) 6.62 g
(d) None of those. If so, what is your answer?
Part C) In sulfur dichloride molecule, the number of non-bonding electron pairs on central atom is:
(a) 0…
Chapter 5 Solutions
Chemistry
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