16<br> If t> 0 and +2-4 = 0, what is the value of ' ?

A sample of a compound that contains only the elements c, h, and n is completely burned in o2 to produce 44. 0 g of co2, 45. 0 g

Elan Coil [88]

Answer:

B. CH₅N

Explanation:

The combustion reaction of a compound CₐHₓNₙ with O₂ is:

CₐHₓNₙ + O₂ → a CO₂ + X/2 H₂O + n NO₂

Where 1 mole of CₐHₓNₙ with an excess of O₂ produce a moles of CO₂, X/2 moles of H₂O and n moles of NO₂

Thus, you need to convert the mass of CO₂ and H₂O to moles to find the C:H ratio and determine a possible empirical formula thus:

Moles CO₂ (Molar mass 44g/mol):

44g ₓ (1mol / 44g) = 1 mole CO₂ = 1 mole C

Mole of H₂O (Molar mass 18g/mol):

45g ₓ (1 mol / 18g) = 2.5 moles H₂O = 5 moles H

Thus, in the compound you have 5 moles of H per mole of C, and a possible empirical formula is:

B. CH₅N

The only structure that meet this C:H ratio

8 0

3 years ago

One of alcohol’s effects is to

ivann1987 [24]

Slurred speech, slow reaction time

3 0

3 years ago

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I have 2 warnings :)

mrs_skeptik [129]

Answer:

for what?? what happened

7 0

4 years ago

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Use the sample data and confidence level given below to complete parts a through d.

4vir4ik [10]

Using the information given and the z-distribution, it is found that:

a) The point estimate of the population proportion is 0.5544.

b) The margin of error is: 0.0320.

c) The interval is: (0.5224, 0.5864).

d) The interpretation of the interval is: we are 95% sure that the true population proportion is between 0.5224 and 0.5864.

<h3>What is a confidence interval of proportions?</h3>

A confidence interval of proportions has the bounds given by the rule presented as follows:

$\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}$

In which the variables used to calculated these bounds are listed as follows:

$\pi$ is the point estimate of the population proportion.

z is the critical value.

n is the sample size.

The confidence level is of 95%, hence the critical value z is the value of Z that has a p-value of $\frac{1+0.95}{2} = 0.975$ , so the critical value is z = 1.96.

From the sample, the sample size and the point estimate are given as follows:

$n = 929, \pi = \frac{515}{929} = 0.5544$

The margin of error is given by:

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

$M = 1.96\sqrt{\frac{0.5544(0.4456)}{929}}$

M = 0.0320.

The interval is the point estimate plus/minus the margin of error, hence:

Lower bound: 0.5544 - 0.0320 = 0.5224.

Upper bound: 0.5544 + 0.0320 = 0.5864.

More can be learned about the z-distribution at brainly.com/question/25890103

#SPJ1

4 0

1 year ago

The equation

ryzh [129]

Answer:

B. -3

Explanation:

Our equation is: $\frac{24x^2+25x-47}{ax-2} =-8x-3-\frac{53}{ax-2}$ . We see that both sides have a term with denominator ax - 2, so let's add $\frac{53}{ax-2}$ to both sides:

$\frac{24x^2+25x-47}{ax-2} =-8x-3-\frac{53}{ax-2}$

$\frac{24x^2+25x-47}{ax-2}+\frac{53}{ax-2} =-8x-3$

$\frac{24x^2+25x+6}{ax-2}=-8x-3$

Now multiply both sides by ax - 2:

$24x^2+25x+6=(-8x-3)(ax-2)=-8ax^2-3ax+16x+6$

$24x^2+25x+6=(-8a)x^2+(16-3a)x+6$

We essentially want to make the terms on each side match. Look at the coefficient of x² on the left side: it's 24. That means on the right side, it should be 24, as well. Then, set -8a equal to 24:

-8a = 24

a = -3

Thus, the answer is B.

4 0

3 years ago

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16 If t> 0 and +2-4 = 0, what is the value of ' ?