<u>Answer:</u> The half life of the given radioactive isotope is 43.86 minutes
<u>Explanation:</u>
Rate law expression for first order kinetics is given by the equation:
where,
k = rate constant = ?
t = time taken for decay process = 233 minutes
= initial amount of the reactant = 0.500 M
[A] = amount left after decay process = 0.0125 M
Putting values in above equation, we get:
The equation used to calculate half life for first order kinetics:
where,
= half-life of the reaction = ?
k = rate constant =
Putting values in above equation, we get:
Hence, the half life of the given radioactive isotope is 43.86 minutes
You use the element symbol and draw the valence electrons. The valence electrons is the number of electrons on the outer shell. An easy way to know how many valence electrons there are, you can look at a periodic table and see what group the element is in. Group 1 has 1 valance electron. Group 2 has 2 valence electrons, and so on... so in the example you gave me, since there is 3 fluorines, and 1 boron, you want to arrange the 3 fluorines around the 1 boron so the electrons can bond with each other.
Answer:
The answer to your question is V2 = 746.1 ml
Explanation:
Data
Pressure 1 = P1 = 689.1 mmHg
Volume 1 = V1 = 607.2 ml
Pressure 2 = P2 = 560.8 mmHg
Volume 2 = V2 = ?
Process
To solve this problem use Boyle's law
P1V1 = P2V2
-Solve for V2
V2 = P1V1/P2
-Substitution
V2 = (689.1 x 607.2) / 560.8
-Simplification
V2 = 746.1 ml
Answer:
Explanation:
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Answer:
The answer to your question is pH = 3.3
Explanation:
Data
pH = ?
[HNO₂] = 0.00052 M
pH measures the [H⁺] in a solution. It has a range of 0 to 14. Acids have a pH from 0 to 6.9, a neutral solution has a pH of 7.0 and alkalis have a pH from 7.1 to 14.
Formula
pH = -log [H⁺]
Substitution
pH = -log[0.00052]
Simplification
pH =- (-3.284)
-Result
pH = 3.3