SOLUTION: Andrew measures the amount of a very unstable substance to be 100 moles. The half life of this substance is three days (after three days, half is gone).
#1 Write an exponential
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#1 Write an exponential
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Question 847275: Andrew measures the amount of a very unstable substance to be 100 moles. The half life of this substance is three days (after three days, half is gone).
#1 Write an exponential function that models this situation where y is the amount of substance and x is time in days.
#2 Use your equation to complete the chart.
Days
-3(3 days prior)
0
3
6
12
Amount (I need to determine the amounts)
#3 Use your data from the chart to graph your equation.
#4 Calculate the expected amount of substance if Andrew had taken his measurement 9 days earlier. Show your calculations and consider the trend of your graph.
You can put this solution on YOUR website! Andrew measures the amount of a very unstable substance to be 100 moles. The half life of this substance is three days (after three days, half is gone).
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#1 Write an exponential function that models this situation where y is the amount of substance and x is time in days.
y = 100*(1/2)^x
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#2 Use your equation to complete the chart.
Days
-3(3 days prior):: y = 100(1/2)^(-3) = 100(1/8) = 12.5
I'll leave the others to you.
0
3
6
12
Amount (I need to determine the amounts)
#3 Use your data from the chart to graph your equation.
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#4 Calculate the expected amount of substance if Andrew had taken his measurement 9 days earlier. Show your calculations and consider the trend of your graph.
y(-9) = 100(1/2)^-9 = 0.1953 moles
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Cheers,
Stan H.