A children's liquid medicine contains 100 mg of the active ingredient in 5 mL. If a child should receive 150 mg of the active in
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Answer:
Hello your question is poorly written below is the well written question
Uranium, an important component of both nuclear weapons and nuclear reactors, has two major isotopes, U-238, which has a half-life of approximately 4.5 billion years, and U-235, which has a half-life of approximately 700 million years. Both were present in equal amounts at the time of the creation of the Earth, 4.5 billion years ago. How many years after the creation of the Earth had the amount of radiation from uranium decayed to half the amount present at the time of the creation of the Earth
Answer : 140 billion years
Explanation:
Given that :
U-238 h1/2 = 4.5 billion years
U-235 h1/2 = 700 million years
At the beginning both Isotopes where present in equal amount
Determine the T years before the amount of Uranium decays to Half
T = ? N'2 = N1 / 2
we know that N = No ( 1/2 )^h where h = time / half-life time
attached below is the detailed solution of the given problem
<u>Answer:</u> The value of for the surrounding when given amount of CO is reacted is 432.52 J/K
<u>Explanation:</u>
Entropy change is defined as the difference in entropy of all the product and the reactants each multiplied with their respective number of moles.
The equation used to calculate entropy change is of a reaction is:
For the given chemical reaction:
The equation for the entropy change of the above reaction is:
We are given:
Putting values in above equation, we get:
Entropy change of the surrounding = - (Entropy change of the system) = -(-173.008) J/K = 173.008 J/K
We are given:
Moles of CO gas reacted = 2.25 moles
By Stoichiometry of the reaction:
When 2 moles of CO is reacted, the entropy change of the surrounding will be 173.008 J/K
So, when 2.25 moles of CO is reacted, the entropy change of the surrounding will be =
Hence, the value of for the surrounding when given amount of CO is reacted is 432.52 J/K