The half-life of polonium-210, given that it decays from 98.3 micrograms to 12.3 micrograms in 414 days is 138 days
<h3>How to determine the number of half-lives </h3>
- Original amount (N₀) = 98.3 micrograms
- Amount remaining (N) = 12.3 micrograms
- Number of half-lives (n) =?
2ⁿ = N₀ / N
2ⁿ = 98.3 / 12.3
2ⁿ = 8
2ⁿ = 2³
n = 3
<h3>How to determine the half life </h3>
- Number of half-lives (n) = 3
- Time (t) = 414 days
- Half-life (t½) = ?
t½ = t / n
t½ = 414 / 3
t½ = 138 days
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Many people wonder why we have the four seasons.These four seasons are Winter, Summer,Spring, and Fall.These seasons let us know things like what to wear, things to eat and places to go.Some people just think that's the way the world is,Winter is suppose to snow and be cold and in summer is suppose to be hot.
Why do we have seasons and What causes it
When the world rotates it tiltes onto different angles.Which means where ever the sun is it will be hotter and the least the sun, the more the wind.When the earth tilte, it tiltes on the earths axis which is an imagine line between the north and the south pole.When our part of the world is facing the sun it's day and when where facing away it's night.The earth circles around the sun year after year
<span> </span><span> every day and night are equal length. </span>
<span>do you have choices to choose from?
</span>
Answer:
C) 2 H2(g) + O2 (g) 2 H2O (l) AH° = -571.6
kJ/mol
Explanation:
The magnitude of heat released in an exothermic reaction is shown by the magnitude of the change in enthalpy.
The more negative the enthalpy change of the reaction, the more the heat released by the process.
Hence, 2 H2(g) + O2 (g) 2 H2O (l) AH° = -571.6
kJ/mol has the most negative value of enthalpy change hence the greatest amount of heat is released in this reaction.