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3 years ago

7

How much voltage is required to run 1.6 A of current through a 240

1 answer:

pentagon [3]3 years ago

6 0

Answer:

answer is not there

Explanation:

V=1.6×240

V=384volt

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Which element has 3 valence electrons in the 4d sublevel?<br><br> A. V<br> B. Nb<br> C. Cu<br> D. Tl

Lilit [14]

Nb, the transition metal(d) subshell will always be n-1, meaning the 3d subshell will be in row(period) 4. So if it’s 4d then it is row(period) 5, and if it has 3 valence electrons then the element is located in column V, or the third column in the transition metal section.

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3 years ago

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An unknown material has a mass of 5.75 g and a volume of 7.5 cm3.

Shtirlitz [24]

Hey there!:

Mass = 5.75 g

Volume = 7.5 cm³

Therefore:

Density = mass / volume

D = 5.75 / 7.5

D = 0.7 g/cm³

Answer C

Hope that helps!

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3 years ago

4 multicellular yes autotrophic It is unable to move around its environment. A. Kingdom animalia B. kingdom fungi C. kingdom pla

Alina [70]

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4 multicellular yes autotrophic It is unable to move around its environment.

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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

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3 years ago

Rust forms because iron and oxygen are highly ______ elements.

Oliga [24]

IT forms because they are highly reactive elements.

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3 years ago