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2 years ago

6) Find the area of a concrete pad with a length of 20 m and a width of 20 m.

Chemistry

2 answers:

Oksanka [162]2 years ago

7 0

Answer:

400 $m^{2}$

Explanation:

The formula for area is Area = length x width.

Therefore we do 20 x 20 to get 400 $m^{2}$ .

Bogdan [553]2 years ago

6 0

Answer:

400

Explanation:

20*20 equals 400 area equals L x W

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Mike, Jackie, Jeremy, and Niki were widely known to the be the fastest fifth graders at Robinson Elementary School. They wanted

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Jackie is the fastest student. (Option A)

Explanation:

From the table it was understood that their speeds are given in meter per second, that is how many meters they run in one second. It was again shown that Jackie's race speed is 5.3 meter per second and all the other three namely Jeremy's speed is 3.9 meter per second, Mike's speed is 4.1 meter per second and finally Niki's speed is 3.8 meter per second.
So, by comparing with others Jackie is the fastest runner in that race.

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2 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

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Answer: The theoretical yield of aspirin is 4.14 g

Explanation:

To calculate the moles :

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

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$C_9H_6O_3+C_4H_6O_3\rightarrow C_9H_8O_4+C_2H_3O_2$

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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

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2 years ago

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Answer:

Option A is not true

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3 years ago

Which group (give the number) is characterized by 5 valence electrons in the configuration<br> s²p3?

Ivahew [28]

<h3>Answer:</h3>

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<h3>Explanation:</h3>

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3 years ago

6) Find the area of a concrete pad with a length of 20 m and a width of 20 m.​

6) Find the area of a concrete pad with a length of 20 m and a width of 20 m.