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ch4aika [34]
3 years ago
10

How long will it take for the concentration of xy to decrease to 12.5% of its initial concentration when the initial concentrati

on is 0.100?
Chemistry
1 answer:
tester [92]3 years ago
5 0
According to the decomposition of XY is second order, and we assume that the rate constant (K) = 6.92 X 10^-3 M^-1 :

So according to this formula:
Kt= 1/[XY]t - 1/[XY]o

 when [XY]o is the initial concentration = 0.1 m & [XY]t is the concentration after passing a period of time= 0.1 x 0.125 = 0.0125 m 
and when K= 6.92X10^-3 M^-1

 By substitution:

t = (1/[XY]t - 1/[XY]o) / K
  =(1/0.0125 - 1/0.1) / 6.92X10^-3
∴t  = 1011 S = 17 min
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Identify the base in the reaction (CH3)3N(aq) + HCl(aq) → (CH3)3NH+(aq) + Cl−(aq) 1. (CH3)3NH+(aq) 2. Cl−(aq) 3. (CH3)3N(aq) 4.
bixtya [17]

Answer:

(CH3)3N(aq)

Explanation:

We have to think of the definition of acid and base in the sense of Brownstead-Lowry. The Brønsted–Lowry theory is an acid–base reaction theory which was proposed independently by Johannes Nicolaus Brønsted and Thomas Martin Lowry in 1923.

A Bronsted-Lowry acid is a chemical species that donates one or more hydrogen ions in a reaction. In contrast, a Bronsted-Lowry base accepts hydrogen ions. When it donates its proton, the acid becomes its conjugate base. A more general approach to the theory is viewing an acid as a proton donor and a base as a proton acceptor.

If we look at the reaction closely, we can see that (CH3)3N(aq) accepted a proton. According to the definition above, we will have to classify (CH3)3N(aq) as a base. Hence the answer.

7 0
3 years ago
Explain why in the early morning just before dawn breaks, the temperature of the air
Oksanka [162]

Answer:

Once the sun comes up, the sunlight excites the cold air in the first foot or so above the ground (which can be 10 or more degrees colder), which causes it to move around and mix into the next several feet of air. That “mixing upward” drops the temperature of the air at thermometer level.

Explanation:

7 0
3 years ago
Nitrogen can exist as a solid, a liquid, or a gas. Which of the following lists the
leva [86]
I would say it’s 4

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5 0
3 years ago
--IF YOU PUSH SOMETHING WITH STRONG FORCE DOES THE MOTION GO SLOWER
zaharov [31]

Answer:

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Explanation:

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8 0
2 years ago
Read 2 more answers
What is the ratio (in the form of a decimal) of the root-mean-square speed of 238UF6 to that of 235UF6 at constant temperature?
NNADVOKAT [17]

Answer:

ratio=0.996m/s

Explanation:

RMS=\sqrt{\frac{3RT}{M} }; M= molecular weight of compound;

RMS speed is inversly proportional to the molecular weight hence compound having less molecular weight will have more rms speed value.

V1 for 238 UF_{6}; M1=238+114=352g/mole

V1 for 235 UF_{6}; M1=238+114=352g/mole

V1=\sqrt{\frac{3RT}{352} };

V2=\sqrt{\frac{3RT}{349} };

\frac{V1}{V2}=ratio of 238UF_{6} F6 to 235UF_{6}=\sqrt{\frac{349}{352} };

\frac{V1}{V2} =0.9957m/s;

\frac{V1}{V2} =0.996m/s;

4 0
3 years ago
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