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GuDViN [60]
3 years ago
15

The following data were obtained for the reaction 2A + B → C where rate = Δ[C]/Δt [A](M) [B](M) Initial Rate (M/s) 0.100 0.0500

2.13 × 10–4 0.200 0.0500 1.70 × 10–2 0.400 0.100 1.36 × 10–1 What is the value of the rate constant?
Chemistry
1 answer:
Roman55 [17]3 years ago
7 0

Answer :  The value of the rate constant 'k' for this reaction is 2.67\times 10^{2}M^{-2}s^{-1}

Explanation :

Rate law is defined as the expression which expresses the rate of the reaction in terms of molar concentration of the reactants with each term raised to the power their stoichiometric coefficient of that reactant in the balanced chemical equation.

For the given chemical equation:

2A+B\rightarrow C

Rate law expression for the reaction:

\text{Rate}=k[A]^a[B]^b

where,

a = order with respect to A

b = order with respect to B

Expression for rate law for first observation:

2.13\times 10^{-4}=k(0.100)^a(0.0500)^b ....(1)

Expression for rate law for second observation:

1.70\times 10^{-2}=k(0.200)^a(0.0500)^b ....(2)

Expression for rate law for third observation:

1.36\times 10^{-1}=k(0.400)^a(0.100)^b ....(3)

Dividing 2 by 1, we get:

\frac{1.70\times 10^{-2}}{2.13\times 10^{-4}}=\frac{k(0.200)^a(0.0500)^b}{k(0.100)^a(0.0500)^b}\\\\80=2^a\\\\\log 80=a\times \log 2\\\\a=6

Dividing 3 by 2 and put value of a = 6, we get:

\frac{1.36\times 10^{-1}}{1.70\times 10^{-2}}=\frac{k(0.400)^6(0.100)^b}{k(0.200)^6(0.0500)^b}\\\\8=2^{(b+6)}\\\\b+6=3\\\\b=-3

Thus, the rate law becomes:

\text{Rate}=k[A]^a[B]^b

\text{Rate}=k[A]^6[B]^{-3}

Now, calculating the value of 'k' by using any expression.

2.13\times 10^{-4}=k(0.100)^6(0.0500)^{-3}

k=2.67\times 10^{2}M^{-2}s^{-1}

Hence, the value of the rate constant 'k' for this reaction is 2.67\times 10^{2}M^{-2}s^{-1}

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How many moles are in 1.20 times 10^25 atoms of phosphorus
Stels [109]

19.927 moles are in 1.20 times 10^{25} atoms of phosphorus.

<h3>What are moles?</h3>

A mole is defined as 6.02214076 ×10^{23} of some chemical unit, be it atoms, molecules, ions, or others.

1 mole of any substance contain Avogadro's number of molecules so we can calculate the number of moles by dividing the provided number of atoms over Avogadro's number to obtain the number of moles .

Moles= \frac{Atoms}{\;Avogadro's \;number }

Moles=  1.20 X 10^{25} atoms ÷ 6.022 X 10^{23}

= 19.927

Hence, 19.927 moles are in 1.20 times 10^{25} atoms of phosphorus.

Learn more about moles here:

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5 0
1 year ago
in a typical person, the level of glucose is about 85 mg/ 100 mL of blood. if an average body contains about 11 pt of blood, how
Vanyuwa [196]

Let's note that 1 pint = 473.1765 mL, so 11 pints should be 5204.9415 mL.

We make a proportion out of the word problem

(85 mg glucose/ 100 mL) times (1 g/ 1000 mg) = 4.4242 grams of glucose

5 0
3 years ago
PLEASE HELP I NEED IT!!!!!
galina1969 [7]
Answer:
Molarity = 2.3 M

Explanation:
Molarity can be calculated using the following rule:
Molarity = number of moles of solute / volume of solution

1- getting the number of moles:
We are given that:
mass of solute = 105.96 grams
From the periodic table:
atomic mass of carbon = 12 grams
atomic mass of hydrogen = 1 gram
atomic mass of oxygen = 16 grams
Therefore:
molar mass of C2H6O = 2(12) + 6(1) + 16 = 46 grams
Now, we can get the number of moles as follows:
number of moles = mass / molar mass = 105.96 / 46 = 2.3 moles

2- The volume of solution is given = 1 liter

3- getting the molarity:
molarity = number of moles of solute / volume of solution
molarity = 2.3 / 1
molarity = 2.3 M

Hope this helps :)
8 0
3 years ago
A white crystalline salt conducts electricity when it is melted and when it dissolves in water.
sergeinik [125]

Answer: Option (a) is the correct answer.

Explanation:

Ionic salts are defined as the salts which tend to contain ionic bonds as there occurs transfer of electrons between its combining atoms.

So, when an ionic salt melts or it is dissolved in water then it will dissociate into its respective ions and as electricity is the flow of electrons or ions. Hence, this salt is then able to conduct electricity.

As covalent compounds are insoluble in water so, they do no dissociate into ions. Hence, they do not conduct electricity.

Similarly, metallic and network solids do not dissociate into ions either when melted or dissolved in water. Therefore, they also do not conduct electricity.

Thus, we can conclude that when a white crystalline salt conducts electricity when it is melted and when it dissolves in water then this bond is of ionic type.

7 0
3 years ago
Container A (with volume 1.23 L) contains a gas under 3.24 atm of pressure. Container B (with volume
kolbaska11 [484]

Now that a lot of pressure

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