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The reaction of bromine gas with chlorine gas has a Kc value of 7.20 at 200°C. If a closed 2.50 L vessel were charged with the two reactants, with the former weighing 9.65 g while the latter is 5.70 g, what would be the equilibrium concentration of the two reactants and BrCl(g)? Determine whether the forward or the reverse reaction will be favored. Explain your answer.
Which substance in each pair has the higher entropy, JUSTIFY YOUR ANSWER
A. 2 mol of He(g) at 100 K and 1 atm or 2 mol of He(g) at 150 °C and 0.2 atm
B. a mixture of 4 mol of H2 (g) and 1.5 mol of N2(g) at 25 °C and 1 atm or, sample of 3 mol of NH3 (g) at 25°C and 1 atm
Which of the following is TRUE about the law of conservation of energy? *
a. ∆E_sys = ∆E_surr
b. ∆E_sys = -∆E_surr
c. ∆E_sys - ∆E_surr = 0
d. none of the above
What is the ∆E for a gas that releases 43 J of heat and has 120 J of work done on it. *
a. 55 J
b. 77 J
c. 99 J
d. 110 J
Colligative property depends on the amount of ___________. *
a. Solvent
b. Solute
c. Ions
Which of the following is a characteristic of a non-electrolyte? *
a. Dissolves in water and conducts electricity
b. Dissolves in water but does not conduct electricity
c. A substance made up of ionic bonds
d. A substance formed by transfer electrons
How many moles of KBrO3 are required to prepare 0.0700 moles of Br2 according to the reaction: KBrO3 + 5KBr + 6HNO3 6KNO3 + 3Br2 + 3H2O *
A. 0.210
B. 0.0732
C. 0.0704
D. 0.220
A 500mL solution is made by dissolving 30.0g of NaCl in water. What is the molarity of the solution? *
A. 0.03
B. 1.03
C. 2.03
D. 3.03
A 50-g aqueous solution of phosphoric acid (H3PO4) contains 10.0 g of phosphoric acid. What is the mole fraction of solute? *
A. 0.0501
B. 0.0439
C. 0.415
D. 0.604
A solution is prepared by dissolving 25g of sucrose in 300 g of water. What is the % by mass of the solute? *
A. 6.55%
B. 9.09%
C. 7.69%
D. 8.33%
