The original mass of krypton 81 that is present in the ice is 6.70 grams.
<h3>How do we calculate original mass?</h3>
Original mass of any substance will be calculated as below for the decomposition reaction is:
N = N₀(1/2)ⁿ, where
N = remaining mass of krypton-81 = 1.675g
N₀ = original mass of krypton-81 = ?
n will be calculated as:
n = T/t, where
T = total time period = 458,000 years
t = half life time = 229,000 years
n = 458,000/229,000 = 2
Now putting all these values on the above equation, we get
N₀ = 1.675 / (1/2)²
N₀ = 6.70 g
Hence required mass is 6.70 g.
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Answer:
Explanation:
Hello,
In this case, the molecular chemical reaction is written as:
In such a way, considering the net ionic notation and the solid yielded copper (I) bromide, we write:
Whereas ammonium and sulfate ions are spectator ions, therefore the net ionic equation is:
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Answer:
B, A, C
Explanation:
the awnsers that are displayed are the only options that are new, and clean resorsces, we have always used oil in cars but hybrids are a new consept, same as wind power
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Answer:
A
Explanation:
Both suspect A and the note has the same number of spots.
Answer:
It is temperature dependent only
Explanation:
For any system in equilibrium, the molar concentration of all species on the right hand side are related to the molar concentrations of those at the left side by a constant known as the equilibrium constant.
- The equilibrium constant is a constant at a given temperature.
- The constant is temperature dependent only.
- It is not dependent on the values of concentration or pressure of a system.