In the reaction of silver nitrate with copper metal, metallic silver comes out of solution, and the solution turns blue. This as
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<u>Answer: </u>
A sample initially contained 150 mg of radon-222. After 11.4 days only 18.75mg of the radon-222 in the sample remained where 3 half-lives have passed
<u>Explanation:</u>
Given, the initial value of the sample, = 150mg
Final value of the sample or the quantity left, A = 18.75mg
Time = 11.4 days
The amount left after first half life will be ½.
The number of half-life is calculated by the formula
where N is the no. of half life
Substituting the values,
On equating, we get, N = 3
Therefore, 3 half-lives have passed.
3.6 moles required when each quantity of reactant completely reacts.
The ratio of the mole quantities of any two compounds present in a balanced chemical reaction is known as the mole ratio. A reaction's product yield can be predicted using mole ratios, as can the amount of reactant required to produce a specific amount of result.
The balanced chemical equation is :
(l) →
(g) +
(g)
Given is = 2.6 mol
As we see, 3 moles of reacts with 4 moles of
.
Therefore,
n( ) = n(
) ×
n( ) =
n( ) = 3.6 moles.
Therefores, 3.6 moles required when each quantity of reactant completely reacts.
Learn more about moles here;
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