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3 years ago

Please help brainiest.

Chemistry

1 answer:

olga nikolaevna [1]3 years ago

5 0

Answer:

The answer is the one in the top left

Explanation:

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Why all goals cannot be met in economics?

muminat

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'ends' that is goals, and "scarce means" referred to the resources. So that is the economic problem, that there are *unlimited* wants but scarce resources. So the answer to this question is just: All goals cannot be reached because there are unlimited "goals", and few/limited resources.</span>

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3 years ago

Assuming the measured volume of the bottle, 140 mL, is correct, what volume does Charles’s Law predict the air in the bottle sho

Ket [755]

Answer:

b. 128 ml

Explanation:

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3 years ago

You weighed out 0.020 g of your crude aspirin product in order to determine the amount of salicylic acid impurity. Following the

Kitty [74]

Answer:

The correct answer is 7.8 percent.

Explanation:

As mentioned in the given question, the absorbance (A) of the sample solution is 1.07. To find the concentration of aspirin, Beer's law is used, that is, A = ebc

Here, e is the extinction coefficient, which is equal to 139.322 M^-1cm^-1 as per the standard value for salicylic acid, b is the pathlength, which is equivalent to 1 cm. Now putting the values we get,

A = ebc

c = A / (eb)

c = 1.07 / (139.322 × 1)

c = 0.00768 M

Now to determine the percent salicylic acid in the sample, there is a need to compare the value of concentration determined with the concentration of aspirin given initially.

0.02 grams is the initial concentration of aspirin mentioned in the question. The molar mass of aspirin is 240 g/mol.

Therefore, the moles of aspirin will be,

0.02 / 240 = 8.33 × 10^-5 moles

The final volume of the diluted solution given is 10 ml or 0.01 liters.

The molarity of aspirin in the diluted solution will be,

c1 = 8.33 × 10^-5 / 0.01 = 8.33 × 10^-3 M or 0.00833 M

Now, the percent of salicylic acid in the product will be,

c1 - c / c1 × 100

(0.00833 - 0.00768) / 0.00833 × 100 = 7.8 %

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3 years ago

James exclaims to his chemistry teacher that a new element has been discovered that fits between Nickel and Copper on the period

myrzilka [38]

Aye you have the same class as me bruh I need help on some chemistry qustions

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3 years ago

Read 2 more answers

Limonene is one of the compounds that give lemons their tangy odor. Show the structures of the products expected when limonene r

iVinArrow [24]

Answer:

Explanation:

The alkene reactions in general are addition or oxidation reactions. For the addition reaction, we have to take into account that some of them are marknonikov and other anti-markovnikov. Also for the addition reaction, we will have to take into account if we will have anti or syn products. In the oxidation reaction, we have to know the specifics for each reaction. If the reaction can go to the highest oxidation level, is the double bond is broken, etc.

Each reaction has its <u>specific characteristics</u> (see figures 1 and 2).

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4 years ago