<span>Assuming the reaction is of 1st order, we can
start using the formula for rate of 1st order reaction:</span>
dN / dt = k * N
Rearranging,
dN / N = k dt
Where N = amount of sample, k = rate constant, t = time
Integrating the equation from N = Ni to Nf and t = ti to
tf will result in:
ln (Nf / Ni) = k (tf – ti)
Since k is constant, we can equate to situations.
Situation 1 is triple in size every days, situation 2 is after 20 days.
ln (Nf / Ni) / (tf – ti) = k
ln (3Ni / Ni) / 4 = ln (Nf / 40) / 20
Calculating for Nf,
<span>Nf =
9,720 bacteria </span>
Answer:
1% of 1200 is 12, so to find this we multiply 12 until we get 150
150/12 = 12.5
12.5%
Answer:
120
Step-by-step explanation:
First find the discount
200 * 40%
200 * .40
80
Subtract the discount from the original price
200-80
120
The sale price is 120
Answer:
Option A 26cm3
Step-by-step explanation:
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