Hey yall, Im working on a quiz I completed. I really need to get a 100 I worked
ID: 881528 • Letter: H
Question
Hey yall, Im working on a quiz I completed. I really need to get a 100 I worked all the problems out and i was wondering if one of yall would mind checking it for me. If i missed one if yall could tell me how to get the correct answer?
11. A 9.50 % by mass solution of acetone (C3H6O) in water has a density of 0.9849 g/mL at 20°C. What is the molarity of this solution?
ANS. 1.61 M
12. The vapor pressure of water at 20°C is 17.5 mmHg. What is the vapor pressure of water over a solution prepared from 2.00 × 102 g of sucrose (C12H22O11) and 3.50 × 10^2 g water?
ANS: 17.0
15. A reaction is experimentally found to follow the rate law, Rate = k[A]2 where k = 0.130 M-1min-1. Starting with [A]o = 2.50 M, how many seconds will it take for [A]t = 1.25 M
ANS: 3.08 s
16.A certain first-order reaction A ? B is 25% complete in 42 min at 25°C. What is the half-life of the reaction?
ANS:101 min
18. The first-order decomposition, A ? products, has a rate constant of 0.150 s–1. Starting with [A]o = 0.350 M, how much time is required for [A]t = 0.125 M?
ANS: 6.86 s
19.
Which of the following is the rate law (rate equation) for this reaction?
ANS:rate = k[NO]2[Cl2]2
20. The reaction A + 2B ? products has the rate law, rate = k[A][B]3. If the concentration of B is doubled while that of A is unchanged, by what factor will the rate of reaction increase?
ANS:8
Explanation / Answer
yor are super . all problems are i checked all are correct excpet 15 and 19 problems
15 ) answer : 184.6 sec
you forgot to convert into seconds (your answer is 3.08 s wrong)
19 ) answer : rate = k [NO]2 [Cl2]