A sample of radioactive waste has a half-live of 40 years and an activity level of 4 curies. After how many years will the activ
1 answer:
After 160 years, the activity level of the sample will be 0.5 curies.
<h3>What is half-life?</h3>Half life of any radioactive waste is the half decay of that product.
The formula is
Where, λ is 4 cruies
λ1 is 0.5 cruies
b = 40 years
Putting the values in the equation
Thus, the correct option is 160 years.
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<u>Answer:</u> The mass of methanol that must be burned is 24.34 grams
<u>Explanation:</u>
We are given:
Amount of heat produced = 581 kJ
For the given chemical equation:
By Stoichiometry of the reaction:
When 764 kJ of heat is produced, the amount of methanol reacted is 1 mole
So, when 581 kJ of heat will be produced, the amount of methanol reacted will be =
To calculate mass for given number of moles, we use the equation:
Moles of methanol = 0.7605 moles
Molar mass of methanol = 32 g/mol
Putting values in above equation, we get:
Hence, the mass of methanol that must be burned is 24.34 grams