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3 years ago

what is the molariry of a solution that contains 1.22 mol of hydrogen chloride if the total volume of the solution is 1,251 mL?

Mathematics

2 answers:

hichkok12 [17]3 years ago

7 0

Your molarity would be 0.975 M HCl because it’s moles of solute divided by liters of solvent

Artist 52 [7]3 years ago

3 0

The answer would be 0.975

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Which number is an irrational number?

sattari [20]

The correct answer is B.

Any square root that is not a perfect square is irrational. Root 3 is not a perfect square and therefore, it is irrational. Note the Root 16 is a perfect suare because 4*4=16

5 0

4 years ago

If a research team increases the sample size for a study, the power of their statistical tests will:

Viktor [21]

Answer: c) increase

Step-by-step explanation:

A sample is a finite subset of the entire population on which research statistical test regarding his/ her objective .

As the sample size increases it comes closer to the population size, and so converge to a better result of researcher's analysis.

It means the size of the sample is proportional to the power of their statistical tests.

∴ As the size of the sample increases the power of statistical test increases.

Hence, If a research team increases the sample size for a study, the power of their statistical tests will <u>increases</u>.

Therefore , the correct answer is : c) increase

3 0

3 years ago

An engineer wishes to determine the width of a particular electronic component. If she knows that the standard deviation is 3.3

anyanavicka [17]

Answer:

n=465 rounded up to the nearest integer

Step-by-step explanation:

Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".

The margin of error is the range of values below and above the sample statistic in a confidence interval.

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

$\bar X$ represent the sample mean for the sample

$\mu$ population mean (variable of interest)

$\sigma=3.3$ represent the population standard deviation

Confidence =0.95 or 95%

Me= 0.3, represent the margion of error

n represent the sample size (variable of interest)

The margin of error is given by this formula:

$ME=z_{\alpha/2}\frac{\sigma}{\sqrt{n}}$ (a)

And on this case we have that ME =0.3 mm and we are interested in order to find the value of n, if we solve n from equation (4) we got:

$n=(\frac{z_{\alpha/2} \sigma}{ME})^2$ (b)

The critical value for 95% of confidence interval now can be founded using the normal distribution. And in excel we can use this formla to find it:"=-NORM.INV(0.025,0,1)", and we got $z_{\alpha/2}=1.960$ , replacing into formula (b) we got:

$n=(\frac{1.960(3.3)}{0.3})^2 =464.8336 \approx 465$

So the answer for this case would be n=465 rounded up to the nearest integer

3 0

3 years ago

Raul bought a soft drink and a sandwich for $9.90. What is the price of each if the sandwich cost 3.5 times as much as the soft

lidiya [134]

Hello!

Before creating equations and solving for the values of the soft drink and sandwich, we need to assign variables. We can assign x to the soft drink and sandwich.

Since the sandwich costs 3.5 times as much as the soda, it is written as 3.5x and the soda is just x. Also, the total cost is 9.90 dollars.

3.5x + x = 9.90 (simplify)

4.5x + 9.90 (divide both sides by 4.5)

x = 2.2 | That is the cost of the soda.

To find the cost of the sandwich, we subtract 2.20 from the total cost.

9.90 - 2.20 = 7.70 | That's the cost of the sandwich.

Therefore, the final answer is B, the sandwich costs $7.70 and the soda costs $2.20.

3 0

3 years ago

Use the drawing tools to form the correct answer on the graph.

Charra [1.4K]

Answer: look at the attached image

Step-by-step explanation:

6 0

3 years ago