Which of the following solutes in aqueous solution would be expected to exhibit

Question

Which of the following solutes in aqueous solution would be expected to exhibit the smallest freezing-point lowering (assuming ideal behavior)? 0.1 mNaCl 0.2 m CH_3COOH 0.05 m Al_2(SO_4)_3 0.1 m MgCl_2 0.25 m NH_3 In the reaction 2H_2O_2(aq) rightarrow 2H_2O(l) + O_2(g), the initial concentration of H_2O_2 is 0.542 M and, 21.2 seconds later, the concentration of H_2O_2 is 0.310 M. What is the average rate of reaction over this time interval? Consider the following reaction 8A(g) + 5B(g) rightarrow 8C(g) + 6D(g) If [C] is increasing at the rate of 4.0 mol L^-1s^-1, at what rate is [B] changing? The reaction 2H_2(g) + 2NO(g) rightarrow 2H2O(g) + ?_2(g) is first-order in H_2 and second-order in NO at a particular temperature. What is the rate law?

Explanation / Answer

2)

delta Tf = i*kf*mb

smallest freezing point lowering means smallest value of i*mb

a)

NaCl forms 2 particles

i*mb = 2*0.1 = 0.2

b)

CH3COOH associates

i=0.5

i*mb = 0.5*0.2 =0.1

c)

it breaks into 5 particles

i*mb = 5*0.05 = 0.25

d)

it breaks into 3 particles

i*mb = 0.1*3 = 0.3

e)

NH3 again domerises

i = 0.5

i*mb = 0.5*0.25 =0.125

Answer:

B) 0.2 m CH3COOH

i am allowed to answer only 1 question at a time

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