Question

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1. In the hydrogenation of ethylene using a nickel catalyst, the initial concentration of ethylene is 1.80 mol⋅L−1 and its rate constant (k) is 0.0016 mol⋅L−1⋅s−1 . Determine the rate of reaction if it follows a zero-order reaction mechanism.

Express your answer to two significant figures and include the appropriate units.

2. The reaction 2X →products is a second-order reaction, and the rate constant is 8.8 × 10⁻³ 1/M·s. If the initial concentration of X is 3.00 M, how many seconds does it take for the concentration of X to drop to 0.700 M?

	200 s
	124 s
	9.6 × 10−3 s
	261 s 3. Hydrogen iodide gas decomposes at 410 ∘C: 2HI(g)→H2(g)+I2(g) The following data describe this decomposition: Time (min) 0 20 40 60 80 [HI] 0.500 0.382 0.310 0.260 0.224

a. What is the value of the rate constant for consumption of HI?

b. At what time (in minutes) does the HI concentration reach 0.100 M?

c. In how many minutes does the HI concentration drop from 0.400 M to 0.200 M?

4. At 500 ∘C, cyclopropane (C3H6) rearranges to propene (CH3−CH=CH2). The reaction is first order, and the rate constant is 6.7×10−4s−1. If the initial concentration of C3H6 is 5.50×10⁻² M .

a. What is the molarity of C3H6 after 25 min ?

Express your answer using two significant figures.

b. How many minutes does it take for the C3H6 concentration to drop to 1.00×10⁻² M ?

Express your answer using two significant figures.

c. How many minutes does it take for 20% of the C3H6 to react?

Express your answer using two significant figures.

Answer 1

iS In Initial encentration Second order reachim rata constont a-x) = after ,t conc . t124.4G sec t124 sec- DO 0.382 0.500 、 七 0.100 o.Soo ウ|t=258 min

4 2_ (35 x60) Ci- 2- 303 505 6.7 x 104 Min ts.6 nin