8. What does a chemical equation tell us?

Chemistry

1 answer:

alexgriva [62]3 years ago

8 0

Answer:

answer for this qu..:A

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Polonium-208 undergoes alpha decay. In addition to the alpha

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T/F: The electromagnetic force holds negatively charged electrons in orbit around thr positively charged nucleus of an atom

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Oppositely charged particles attract each other, while like particles repel one another. Electrons are kept in the orbit around the nucleus by the electromagnetic force, because the nucleus in the center of the atom is positively charged and attracts the negatively charged electrons.

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Aspirin (C9H8O4) is synthesized by reacting salicylic acid (C7H6O3) with acetic anhydride (C4H6O3) according to the reaction: C7

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$7.39\times 10^{3}g$ of acetic anhydride is needed

Explanation:

According to balanced equation, 1 mol of salicylic acid completely reacts with 1 mol of acetic anhydride

Number of moles = (mass)/(molar mass)

Molar mass of acetic anhydride = 102.09 g/mol

Molar mass of salicylic acid = 138.121 g/mol

So, $1.00\times 10^{4}g$ of salicylic acid = $\frac{1.00\times 10^{4}}{138.121}moles$ of salicylic acid

Hence, $\frac{1.00\times 10^{4}}{138.121}moles$ of salicylic acid reacts completely with $\frac{1.00\times 10^{4}}{138.121}moles$ of acetic anhydride.

So, mass of acetic anhydride needed = $\frac{1.00\times 10^{4}}{138.121}\times 102.09g$ = $7.39\times 10^{3}g$