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PracticeExam2 - CHM 2045C Name Practice Exam 2 Choose the...

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CHM 2045C Practice Exam 2 Name_________________________________ __ Choose the one alternative that best completes the statement or answers the question. 1) A sample of 8.5 g NH 3 on oxidation produces 4.5 g of NO. Calculate the percent yield. Reaction: 4 NH 3 + 5 O 2 ± 4 NO + 6 H 2 O A) 30% B) 60% C) 15 % D) 70% E) none of the above 2) Calculate the kinetic energy of a 150 - g baseball moving at a speed of 40. m/s (89 mph). 3) What is the reaction for the standard enthalpy of formation for HCl(g)? A) ICl 3 (g) + 2H 3 (g) ± HI(g) + 3 HCl(g) B) H + (aq) + Cl - (aq) ± HCl(g) C) NH 3 (g) + Cl 2 (g) ± NH 2 Cl(g) + HCl(g) D) 1/2 H 2 (g) + Cl 2 (g) ± HCl(g) E) none of these 4) Write a net ionic equation for the neutralization reaction of CH 3 CO 2 H( aq ) with CsOH( aq ). A) CH 3 CO 2 H( aq ) + OH - ( aq ) ± CH 3 CO 2 - ( aq ) + H 2 O( l ) B) CH 3 CO 2 H( aq ) + CsOH( aq ) ± CH 3 CO 2 Cs( aq ) + H 2 O( l ) C) CH 3 CO 2 H( aq ) + Cs + ( aq ) + OH - ( aq ) ± CH 3 CO 2 Cs( s ) + H 2 O( l ) D) CH 3 CO 2 - ( aq ) + H + ( aq ) + Cs + ( aq ) + OH - ( aq ) ± CH 3 CO 2 - ( aq ) + Cs + + H 2 O( l ) 5) Determine the final temperature of a gold nugget (mass = 376 g) that starts at 398 K and loses 4.85 kJ of heat to a snowbank when it is lost. The specific heat capacity of gold is 0.128 J/g°C. 6) Imagine a reaction that results in a change in both volume and temperature, as shown in the diagram below. What is the sign of the work being done, and what is the sign of the enthalpy change involved in this reaction? 1
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7) For a particular process that is carried out at constant pressure, q = 125 kJ and w = - 15 kJ. Therefore, A) ̇ E = 125 kJ and ̇ H = 140 kJ. B) ̇ E = 110 kJ and ̇ H = 125 kJ. C) ̇ E = 125 kJ and ̇ H = 110 kJ. D) ̇ E = 140 kJ and ̇ H = 125 kJ.
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