For the reaction of the ammonium is ion with nitrous acid, the net reaction NH_4
ID: 505675 • Letter: F
Question
For the reaction of the ammonium is ion with nitrous acid, the net reaction NH_4^+ (aq)+ HNO_2(aq) rightarrow N_2(g) + 2H_2O(t) + H^+(aq) If the initial concentration of nitrous acid is 1.00 M and, after concentration of nitrous has fallen to 0.72 M, what is the average rate of the reaction over this time interval? a. -0.015 M/s b. 0.04 M/s 015 M/s d -0.04 M/s e. 0.096 M/s If 11.2 g of C_10Hg is dissolved in 107.8 g of chloroform, CHC1_3, what is the molality of the solution? a. 0.0875 m b. 12.4 m c 811 m d. 0.0941 m e, 0.0969 m Which of the following statements is true concerning the reaction given below? 2H_2S(g) + O_2(g) rightarrow 2s (s) + 2H_2O(g) a. The rate law is Rate = k[H_2S]^2[O_2]. b. The reaction is second-order in H_2SO(g) and first-order c. The reaction is first-order in H_2SCg) and second-order in O_2(g). d. The rate law is Rate = k[H_2S][O2). e rate law may be determined only by experiment. If a reaction is first-order with respect to a particular reactant, when the concentration of that reactant is increased by a factor of 2, the reaction rate will increase by a factor of 2. b. remain constant. c. decrease by a factor of. d. increase by a factor of 8. e, increase by a factor of 4.Explanation / Answer
1.rate of change in concentration of nitrous acid = ( final concentration- initial concentration)/time= (0.72-1)/17=-0.015 M/S ( A is correct)
2. Molality= Moles of soulte ( napthalene)/ kg of solvent (chloroform)
moles of solute= mass of solute/ molar mass = 11.2/128=0.0875
mass of solvent in Kg = 107.8/1000=0.1078 kg
Molality= 0.0875/0.1078=0.811 ( C is correct)
3. rate expression is determined experimentally. However, for elementary reactions, there is correspondence between rate expression and stoichiometry of the reaction. The reaction 2H2S(g) + O2(g) --->2H2O(g)+2S(s) is heterogeneous reaction and not elementary and hence the rate can be determined only experimentally. ( E is correct).
4. for 1st order reaction ,-dCA/dt= KCA
rate is directly proportional to concentration. When concentration is doubled, the rate also gets doubled. Hence Correct asnwer is A.
4.
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