BRAINLIEST IF RIGHTLet’s imagine now that you are in a spaceship in outer space, far from any stars or planets, where there is n
2 answers:
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a. k=0.256/day
b.sample of Au-198 remains after seven days : 1.67 g
<h3>Further explanation</h3>1. A half-life of 2.7 days⇒t1/2=2.7 days
The half-life can be expressed in a decay constant( λ)
2. We can use formula : (integrated rate law) :
Ao=10 g
t=7 days
k=0.256/day
<u>Answer:</u> The percent yield of the reaction is 8.10 %.
<u>Explanation:</u>
To calculate the number of moles, we use the equation:
.....(1)
Given mass of salicylic acid = 0.105g
Molar mass of salicylic acid = 138.12 g/mol
Putting values in equation 1, we get:
The chemical equation for the formation of aspirin from salicylic acid follows:
By Stoichiometry of the reaction:
1 mole of salicylic acid produces 1 mole of aspirin
So, 0.0076 moles of salicylic acid will produce = of aspirin
Now, calculating the mass of aspirin from equation 1, we get:
Molar mass of aspirin = 180.16 g/mol
Moles of aspirin = 0.0076 moles
Putting values in equation 1, we get:
To calculate the percentage yield of aspirin, we use the equation:
Experimental yield of aspirin = 0.111 g
Theoretical yield of aspirin = 1.37 g
Putting values in above equation, we get:
Hence, the percent yield of the reaction is 8.10 %.