Reactant Concentration (mol/L) Rate of Appearance of N 2 (mol/L · s) [NO] [H 2 ]

Question

Reactant Concentration (mol/L) Rate of Appearance
of N2
(mol/L·s) [NO] [H2]
0.420 0.122 0.136 0.210 0.122 0.0339 0.210 0.244 0.0678 0.105 0.488 0.0339 1 the reaction is second order with respectto NO and first order with respect to H2
the reaction is first order with respectto NO and H2
the reaction is second order with respectto NO and H2
the reaction is first order with respectto NO and second order with respect toH2
1 the reaction is second order with respectto NO and first order with respect to H2
the reaction is first order with respectto NO and H2
the reaction is second order with respectto NO and H2
the reaction is first order with respectto NO and second order with respect toH2
1 Reactant Concentration (mol/L) Rate of Appearance
of N2
(mol/L·s) [NO] [H2]
0.420 0.122 0.136 0.210 0.122 0.0339 0.210 0.244 0.0678 0.105 0.488 0.0339

Explanation / Answer

1. Find the order of NO: Use experiment 1 and 2 [H2] stays the same (.122), [NO] is cut in half (.420 to .210), therate is cut in fourth (.136 to .0339) Order of NO: 2 Find the order of H2: Use experiment 2 and 3 [NO] stays the same (.210), [H2] doubles (.122 to .244), the ratedoubles (.0339 to .0678) Order of H2: 1 Answer: Second order with NO and first with H2 (first choice) 2. rate = k[NO]2[H2] 3. Use any of the set data, i'm just going to use the firstone. rate = k[NO]2[H2] .136 = k(.4202)(.122) k = 6.32 4. rate = k[NO]2[H2] rate = (6.32)(.3502)(.205) rate = .159

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