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Strike441 [17]
3 years ago
12

The conversion of ammonium cyanide to urea is a second-order reaction. This means that the concentration C of ammonium cyanide a

t time t is given by 1/C = kt + 1/C0, where C0 is the initial concentration and k is the rate constant. Assume the initial concentration is known to be 0.1 mol/L exactly. Assume that time can be measured with negligible uncertainty.
a. After 45 minutes, the concentration of ammonium cyanide is measured to be 0.0811 ? 0.0005 mol/L. Estimate the rat? constant k, and find the uncertainty in the estimate.

b. Use the result in part (a) to estimate the time when the concentration of ammonium cyanide will be 0.0750 mol/L, and find the uncertainty in this estimate.
Mathematics
1 answer:
sergejj [24]3 years ago
6 0

Answer:

your answer could be A

Step-by-step explanation:

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Solve for k: -3k -3k = -29 + 77
sineoko [7]

Answer:

k=48

Step-by-step explanation:

Add  -29 and 77

k: -3k -3k =48

6 0
3 years ago
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Which graph represents the solution set for the system 6x + y > -3 and 2x + y ≤ 4?
VikaD [51]
This one.

The doubly-shaded area is the solution set. The dashed line is not included.

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4 years ago
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denpristay [2]

Answer:

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7 0
3 years ago
what is the equation of the line that is parallel to the given line and passes through the point (2, 3) ? a. x + 2y = 4 b. x + 2
aleksandr82 [10.1K]

Answer:

see explanations

Step-by-step explanation:

The given blue line has a slope of m = -1/2.

The line parallel to the given line passing through point (x0,y0)=(2,3) is given by the point-slope form:

(y-y0)=m(x-x0)

substitute values

(y-3) = (-1/2)(x-2)

Expand and transpose

y = (-1/2)x + 1 + 3

y = (-1/2)x + 4  ....................(1)

We choose the second equation b. x+2y=8 and convert to slope-intercept form:

2y=-x+8

y = (-1/2)x + 4, which is exactly equation (1)

So

b. x+2y=8 is the correct answer.

3 0
3 years ago
Sam, Maya, and John playing a match, Sam has Half of what Maya has, and maya has fewer than John with three points. Their points
Ksivusya [100]

so john is x and if Maya has the same as john but -3 then

x+x-3

but sam is still missing and she has half of Maya which is 0.5x - 1.5

so the equation is

x+x-3+0.5x-1.5=68

and then you add 3 and 1.5 to 68 which is

2.5x=72.5

and you divide by 2.5 which is 29

John has 29 points


7 0
3 years ago
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