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
Anarel [89]
3 years ago
6

Substance A undergoes a first order reaction A  B with a half- life of 20 min at 25 °C. If the initial concentration of A ([A]◦

) in a sample is 2.7 M, what will be the concentration of A after 60 min?
Chemistry
1 answer:
nydimaria [60]3 years ago
6 0

The concentration of A will be <em>0.34 mol·L⁻¹</em> after 60 min.

In a first-order reaction, the formula for the amount remaining after <em>n</em> half-lives is

\text{[A]} = \frac{\text{[A]}_{0}}{2^{n}}\\

If t_{\frac{1}{2}} = \text{20 min}\\

n = \frac{t}{t_{\frac{1}{2}}} = \frac{\text{60 min}}{\text{20 min}}= \text{3.0}

∴ \text{[A]} = \frac{\text{2.7 mol/L}}{2^{3.0}} = \frac{\text{2.7 mol/L}}{8.0} = \textbf{0.34 mol/L}

You might be interested in
18 the first step in the mechanism is the acid catalyzed generation of an enol and then electrophilic addition of bromine. which
Aliun [14]

the first step in the mechanism is the acid-catalyzed generation of an enol and then electrophilic addition of bromine and cation is formed because of the destabilization effect of the electronegativity of oxygen

The ability of an atom or functional group to draw electrons to itself is known as an electronegativity in chemistry. An atom's electronegativity is influenced by both its atomic number and how far away from its charged nuclei its valence electrons are located.

The ability of an atom to draw shared electrons in a covalent connection is referred to as electronegativity. The stronger an element attracts the shared electrons, the higher its degree of electronegativity.

The propensity of an atom to attract other atoms when it is combined is known as an element's electronegativity. Additionally, a pair of bound electrons are shared. In contrast, an element's electropositivity refers to an atom's propensity to contribute electrons while also withdrawing from covalent connections.

To learn more about electronegativity please visit -
brainly.com/question/17762711
#SPJ4

5 0
2 years ago
Periods On the periodic table represent elements
Natalka [10]

Answer:When you look at the periodic table, each row is called a period (Get it? Like PERIODic table.). All of the elements in a period have the same number of atomic orbitals. For example, every element in the top row (the first period) has one orbital for its electrons.

Explanation:

7 0
3 years ago
7. What must you do before you make a hypothesis?
almond37 [142]

Answer:

Ask a question?

Explanation:

look at the scientific method uwu

6 0
3 years ago
What is a molarity a measurement
USPshnik [31]

Answer:

Molarity indicates the number of moles of solute per liter of solution and is one of the most common units used to measure the concentration of a solution.

Explanation:

8 0
3 years ago
The reaction between NO2 and co to produce no and CO2 is thought to occur in two steps:
MAXImum [283]

Answer:

Correct option is

A

Explanation:

The number of molecules of CO involves in the slowest step will be 0 because CO is not involve in the slowest step i.e. rate determing step.

3 0
3 years ago
Other questions:
  • A vapor composed of 0.60 mole fraction ethanol and 0.40 mole fraction acetic acid at 120.0 mmHg (absolute), is in equilibrium wi
    11·1 answer
  • The chemical symbol for sodium is
    9·1 answer
  • Half-reactions can be written to represent all
    10·2 answers
  • determine the type of the following chemical reaction: Mg(s) + 2HCl(aq)——-&gt; H2(g) + MgCl2(aq) a. single replacement reaction
    5·1 answer
  • If the volume of a cylinder is 84,300 cubic centimeters then how many millimeters is this equal to
    7·1 answer
  • he atomic number of fluorine is 9. How many electrons does an ion of fluorine have if it is represented by the symbol shown belo
    11·2 answers
  • Can carbon atoms share electron with four hydrogen atoms to form a methane molecule? Explain.
    11·1 answer
  • A tank contains 7.0 moles of a mixture of nitrogen gas and oxygen gas. The total
    9·1 answer
  • Ming has two unknown substances. One is nonpolar, and the other is polar.
    7·2 answers
  • Write a chemical equation for the reaction between methane and bromine​
    8·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!