1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Troyanec [42]
3 years ago
11

A particular reactant decomposes with a half-life of 113 s when its initial concentration is 0.372 M. The same reactant decompos

es with a half-life of 223 s when its initial concentration is 0.189 M. Calculate the rate constant (k) and reaction order?
Chemistry
1 answer:
AysviL [449]3 years ago
8 0

Answer:

Rate constant =  0.0237 M-1 s-1, Order = Second order

Explanation:

In this problem, it can be observed that as the concentration decreases, the half life increases. This means the concentration of the reactant is inversely proportional to the half life.

The order of reaction that exhibit this relationship is the second order of reaction.

In the second order of reaction, the relationship between rate constant and half life is given as;

t1/2 = 1 / k[A]o

Where;

k = rate constant

[A]o = Initial concentration

k = 1 / t1/2 [A]

Uisng the following values;

k = ?

t1/2 = 113

[A]o = 0.372M

k = 1 / (113)(0.372)

k = 1 / 42.036 = 0.0237 M-1 s-1

You might be interested in
Whats the molar mass of c6h6
N76 [4]
B I did this on a test
3 0
3 years ago
Question 6
I am Lyosha [343]

Answer:

A. is the correct point.

Explanation:

This is true because no matter how many mL of water is added, the solution only gets more height; the concentration in everything else stays the same, and water doesn't have any concentration. Very confusing, I know. Good luck!

4 0
3 years ago
You find a compound composed only of element "X" and hydrogen, and know that it is 91.26% element X by mass. Each molecule has 2
worty [1.4K]
Since you know the ratio of atoms, you can start to put a formula togeter. The formula might look like:<span>
X<span>H2.67 
</span></span>but since atoms can't come in fractional amounts, we have to multiply the formula by some number in order to turn 2.67 into a whole #, while still maintaining the ratio. Multiplying 2.67 by 3 yields 8, so the most likely ratio in the molecule is

X3H8<span>so the ratio of 1:2.67 is still maintained. The mass percent tells you that out of every 100g of compound, 91.26g is element X, so the other 8.74g must be H. Dividing each mass by the number of moles in the formula gets us the molar mass of each element (approximately). DIviding 8.74g by 8 gets 1.09, roughly the molar mass of hydrogen. Dividing 91.26g by 3 gets us 30.4, roughly the molar mass of phosphorus. Element X is most likely phosphorus</span>
4 0
3 years ago
Read 2 more answers
An experiment was conducted to see which metal pot would be better for cooking food quickly. The table below shows how quickly s
LenaWriter [7]

Answer:

The term conclusion best illustrates the given statement.

Explanation:

Conclusion refers to a decision or judgment that can be acquired by reasoning. From the observation mentioned in the given table:  

1. The steel, aluminum, and bronze took 27, 45 and 80 seconds to dissolve small section of wax, this signifies that more time will be needed by them to transfer heat to the food while cooking. Thus, food will take more time to cook in them.  

2. Copper consumed less time, that is, 15 seconds to melt the section of wax than the other metal pots, which signifies that it is a good conductor of heat than the others. Thus, the copper pot would be good for cooking food briskly.  

After evaluating the results and observations in an experiment, the conclusion was made that pots made of copper are best for cooking foods.  

4 0
3 years ago
A student melts 50.0 grams of ice using 16650 J of energy. What is the heat of fusion of ice?
Shkiper50 [21]
Heat fusion is the amount of energy required to convert one mole of ice into water, 16650J is per 50g so if we divide 16650 by 50 we find it per gram: 16650/50 = 333J/g or 0.33KJ/g

hope that helps :)
6 0
3 years ago
Read 2 more answers
Other questions:
  • The same baseball is thrown two different times The second throw is faster than the first throw.Which has more kinetic energy?
    6·1 answer
  • Over an interval of 3.00 s the average rate of change of the concentration of C was measured to be 0.0840 M/s. What is the final
    12·1 answer
  • What is 1.5 x 10^3 in standard notation
    13·1 answer
  • Hi someone plsss help me
    8·1 answer
  • 100 POINTS PLSSS HELPPP
    6·1 answer
  • Problem
    14·1 answer
  • Which statement best describes how an ionic bond forms?
    14·2 answers
  • Water is split by which part of photosynthesis?
    11·1 answer
  • Please help , I don't know about big bang I'm sorry
    10·1 answer
  • Does the percent by mass of each element in a compound depend on the amount of that element used to make the compound? Explain.
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!