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Wittaler [7]
3 years ago
12

Read through the literacy task

Chemistry
1 answer:
Pavlova-9 [17]3 years ago
4 0

Answer:

Atoms are the smallest particle that make up living <u>both</u><u> </u><u>living</u><u> </u><u>and</u><u> </u><u>non</u><u> </u><u>living</u><u> </u> things, they are made up of subatomic particles; protons, neutrons and electrons. Of these the electrons <u>protons</u><u> </u> and neutrons are in the nucleus and the protons <u>e</u><u>l</u><u>e</u><u>c</u><u>t</u><u>r</u><u>o</u><u>n</u><u>s</u><u> </u>orbit around the nucleus. Of the subatomic particles, the electrons have the largest <u>s</u><u>m</u><u>a</u><u>l</u><u>l</u><u>e</u><u>s</u><u>t</u><u> </u>mass and are negatively charged, the neutrons (negative charge) (<u>no charge)</u> and protons (positively charged) both have a relative mass of 1. Atoms contain an equal number of protons and neutrons <u>electrons</u>, so carry no overall charge. An element is a substance made up of only two <u>one</u> type of atom. Elements can be found in the Periodic table of elements, they usually have two numbers next to the chemical symbol, the larger number is generally the atomic <u>mass</u> number, which represents the number of neutrons and the number of protons. The smaller number is the relative atomic mass <u>atomic</u><u> </u><u>number</u> which represents the number of electrons or neutrons <u>protons</u>. In order to calculate the number of neutrons, you minus the atomic number from the relative atomic mass.

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What is the volume of a sample of liquid mercury that has a mass of 76.2g, given that the density of mercury is 13.6g/mL?
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Aspirin (C9H8O4) is synthesized by reacting salicylic acid (C7H6O3) with acetic anhydride (C4H6O3). The balanced equation isC7H6
prisoha [69]

<u>Answer:</u>

<u>For a:</u> The mass of acetic anhydride needed is 73.91 grams.

<u>For b:</u> The theoretical yield of aspirin is 130.43 grams.

<u>Explanation:</u>

To calculate the number of moles, we use the equation:

\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}   .....(1)

  • <u>For a:</u>

Given mass of salicylic acid = 1.00\times 10^2g=100g

Molar mass of salicylic acid = 138.121 g/mol

Putting values in equation 1, we get:

\text{Moles of salicylic acid}=\frac{100g}{138.121g/mol}=0.724mol

For the given chemical reaction:

C_7H_6O_3+C_4H_6O_3\rightarrow C_9H_8O_4+CH_3COOH

By stoichiometry of the reaction:

1 mole of salicylic acid reacts with 1 mole of acetic anhydride.

So, 0.724 moles of salicylic acid will react with = \frac{1}{1}\times 0.724=0.724mol of acetic anhydride.

Now, to calculate the mass of acetic anhydride, we use equation 1:

Moles of acetic anhydride = 0.724 moles

Molar mass of acetic anhydride = 102.09 g/mol

Putting values in equation 1, we get:

0.724mol=\frac{\text{Mass of acetic anhydride}}{102.09g/mol}\\\\\text{Mass of acetic anhydride}=73.91g

Hence, the mass of acetic anhydride needed is 73.91 grams.

  • <u>For b:</u>

By stoichiometry of the reaction:

1 mole of salicylic acid is producing 1 mole of aspirin.

So, 0.724 moles of salicylic acid will produce = \frac{1}{1}\times 0.724=0.724mol of aspirin.

Now, to calculate the mass of aspirin, we use equation 1:

Moles of aspirin = 0.724 moles

Molar mass of aspirin = 180.158 g/mol

Putting values in equation 1, we get:

0.724mol=\frac{\text{Mass of aspirin}}{180.158g/mol}\\\\\text{Mass of aspirin}=130.43g

Hence, the theoretical yield of aspirin is 130.43 grams.

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