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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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4/9 of apples in a bag are green if there are 36 green apples in the bag how many all together
Rainbow [258]
36 divided by 9 = 4
4 x 4 (the numerator) = 16
6 0
3 years ago
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How many revolutions must be made by a wheel of diameter 2.8m in order to cover a distance of 484km?
arlik [135]
<h2>Answer :</h2>

A wheel is a circle.

Given diameter of wheel = 2.8 m

Then radius of the wheel = 2.8/2 = 1.4 m

Now we know that , circumference of circle =2\pi r

<h3>Then, </h3>

Circumference of wheel = 2 × 22/7 × 1.4

Circumference of wheel = 8.8 m

<u>From the above we can conclude that ;</u>

1 revolution = 8.8 m

x revolution = 484 km = 484000 m

<h3>Thus, </h3>

x =  \frac{1}{8.8}  \times 484000 \\  \\ x = 55000

<h3>Therefore, total of 55,000 revolutions are made by the wheel.</h3>
5 0
3 years ago
A bag contains 5 black marbles, 9 white marbles, and 2 red marbles. One marble is to be chosen at random.
bulgar [2K]
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3 0
3 years ago
Which function is graphed below?<br> y=j3)
natita [175]

Answer:

y = 3(\frac{1}{3} )^{x}

Step-by-step explanation:

See the attached graph.

The points (0,3) and (1,1) are on the graph of the exponential function.

Let the function be y = a(b)^{x} ....... (1)

Now, satisfying the point (0,3) we get from the equation (1),  

3 = a(b)^{0} = a

Therefore, the initial value of the function is a = 3

Hence, the equation becomes y = 3(b)^{x} ......... (2)

Now, satisfying the point (1,1) we get from equation (2)  

1 = 3 (b)^{1}

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So, the final equation becomes y = 3(\frac{1}{3} )^{x} (Answer)

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4 years ago
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Rudik [331]
To determine all the different possibilities, you will find the possible choices for each position in the license and multiply them together.
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4th digit-1/7 (8-1)
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1/5 x 1/4 x 1/8 x 1/7 x 1/26 x 1/25 =1/728000 which means there are 728000 possibilities.
4 0
3 years ago
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