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ANEK [815]
3 years ago
7

At 700 k, the rate constant for this reaction is 6.2 × 10–4 min–1. how many minutes are required for 10.0% of a sample of cyclop

ropane to isomerize to propene?
Mathematics
1 answer:
Anna35 [415]3 years ago
8 0

Answer:

170 min

Step-by-step explanation:

We know that there is a kinetics of the first order, which has the following equation:

ln ([A] t / [A] o) = -k * t

Solving for t:

t = - ln ([A] t / [A] o) / k

How we want to know is the time required with 10%, so [A] t / [A] o = 100% - 10%, that is, 90% = 0.9. We also know that k = 6.2 * (10 ^ -4)

Knowing this, we replace:

t = - ln (0.90) /6.2 * (10 ^ -4)

t = 170 min

Which means it will take 170 minutes.

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This function can be used to determine the number of bacteria in a culture h hours after the culture was started.
dimulka [17.4K]

Answer:

The statement means that after 2 hours, there are 90 bacteria in the culture.

Step-by-step explanation:

The number of bacteria after x hours is given by the function states in the exercise. We have that f(x) will be the number of bacteria after x hours.

Which statement best describes the meaning of the equation f(2) = 90 ?

The statement means that after 2 hours, there are 90 bacteria in the culture.

3 0
3 years ago
Three consecutive integers are n, n+1, and n+2.
Vera_Pavlovna [14]
<span>We convert the sentences to mathematical expressions as follows


"</span>Four times the sum of the least and greatest integers" : 4[n+(n+2)]

"is 12 less than three times the least integer": = 3n-12



So we have:

4[n+(n+2)]=3n-12   (this is the equation)

4[2n+2]=3n-12
8n+8=3n-12

8n-3n=-12-8
5n=-20

n=-20/5=-4


Answer: the equation is 4[n+(n+2)]=3n-12 , the least integer is -4
8 0
3 years ago
Use the commutative law of multiplication to rewrite 67 x 13.
KonstantinChe [14]

Answer:

A. 671*3

B. 67*13

C. 3*1*7*6

D. 1*80

5 0
3 years ago
What is the slope of the line that passes through the points (-6,-4) and
AveGali [126]

Answer:

0

Step-by-step explanation:

Use slope intercept form: \frac{y_2-y_1}{x_2-x_1}

\frac{-4-(-4)}{-12-(-6)} = \frac{0}{-6} = 0

5 0
3 years ago
A is (-2,1)
valkas [14]

1) in order to solve this problem you must to obtain The value of K,  for it you know by definition  that the  horizontal slope  of the side BC  is zero ,

then m = Y2-Y/X2-X1,   0 = 5-K/4-6⇒0 = 5-K⇒K = 5

known this value for K   you ca find the equation of thE line that pass through  A and C

2) Following the same procedure in first place you calculate the slope with the points A(-2,1) Y C ( 4,5)

m= 5-1/4-(-2) = 2

now with any point  A  or C and the slope you obtain the line

A(-2,1)

y-y1 = m (x-x1) ,   Y-1= 2(X-(-2)⇒Y-1= 2X+4⇒Y=2X+4-1⇒Y =2X+3


7 0
3 years ago
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