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3 years ago

Which kind of climate do the most stable ecosystems tend to have?

1 answer:

6 0

B because the climate has to be pretty balanced and if it’s too cold it won’t be habitable and if the climate is too hot it won’t be habitable aswell

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The picture below shows a warm air mass caught between two cooler air masses. What is this type of front called??

boyakko [2]

An occluded front forms when a warm air mass is caught between two cooler air masses.

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3 years ago

What word is used to refer to a group of organ systems working together?

kotegsom [21]

Answer:

Explanation:

in my opinion,The answer would be organism

please mark me as brainliest

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3 years ago

The range in size of most atomic radii is approximately what?

Nastasia [14]

It is approximately 10 ^ -10

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3 years ago

HELPPPP ANSWERSS!!! A. 13 B. 8 C. 15 D. 5

KATRIN_1 [288]

Answer:

Explnation:

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3 years ago

Aspirin can be prepared from salicylic acid ( C 7 H 6 O 3 CX7HX6OX3), which has a molar mass of 138.12 g/mol, and acetic anhydri

pychu [463]

Answer: The theoretical yield of aspirin is 4.14 g

Explanation:

To calculate the moles :

$\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}$ $\text{Moles of salicylic acid}=\frac{3.20g}{138.12g/mol}=0.023moles$

mass of acetic anhydride = $density\times volume =1.082g/ml\times 3.71ml=4.01g$

$\text{Moles of acetic anhydride}=\frac{4.01g}{102.04g/mol}=0.039moles$

$C_9H_6O_3+C_4H_6O_3\rightarrow C_9H_8O_4+C_2H_3O_2$

According to stoichiometry :

1 mole of salycylic acid require 1 mole of acetic anhydride

Thus 0.023 moles of salycylic acid require= $\frac{1}{1}\times 0.023=0.023moles$ of acetic anhydride

Thus salycylic acid is the limiting reagent as it limits the formation of product and acetic anhydride is the excess reagent.

As 1 mole of salycylic give = 1 mole of aspirin

Thus 0.023 moles of salycylic acid give = $\frac{1}{1}\times 0.023=0.023moles$ of aspirin

Mass of aspirin = $moles\times {\text {Molar mass}}=0.023moles\times 180.15g/mol=4.14g$

Thus theoretical yield of aspirin is 4.14 g

4 0

3 years ago