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gregori [183]
3 years ago
11

If 9.87g of As2O3 reacts with carbon, then 7.71g of As should be produced. If only 6.33g of As is actually produced, what is the

percent yield of As?
a 82.1%
b 0.821%
c 64.1%
d 0.641 %
Chemistry
2 answers:
salantis [7]3 years ago
8 0

Answer:

82.1%

Explanation:

A. I got it right on my test

Flauer [41]3 years ago
5 0

Answer:

A

Explanation:

Percent yield= Actual yield/Theoretical yield x 100

The problem tells you that 6.33g of As is produced (actual yield), but 7.71g should be produced (theoretical yield). So 6.33/7.71= 0.821 x 100= 82.1%

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Explanation:

D. i had this on my science test!!!

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When 3.00 g of Mg is ignited in 2.20 g of pure oxygen, what is the limiting reaction? What is the theoretical yield of MgO?
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4 years ago
compound consists of carbon, hydrogen and fluorine. In one experiment, combustion of 2.50 g of the compound produced 3.926 g of
arlik [135]

<u>Answer:</u> The empirical and molecular formula of the compound is CH_2F and C_{14}H_{28}F_{14}  respectively

<u>Explanation:</u>

We are given:

Mass of CO_2=3.926g

<u>For calculating the mass of carbon:</u>

In 44 g of carbon dioxide, 12 g of carbon is contained.

So, in 3.926 g of carbon dioxide, \frac{12}{44}\times 3.926=1.071g of carbon will be contained.

To calculate the percentage composition of element in sample, we use the equation:

\%\text{ composition of element}=\frac{\text{Mass of element}}{\text{Mass of sample}}\times 100      ......(1)

  • <u>For Carbon:</u>

Mass of carbon = 1.071 g

Mass of sample = 2.50 g

Putting values in equation 1, we get:

\%\text{ composition of carbon}=\frac{1.071g}{2.50g}\times 100=42.84\%

  • <u>For Fluorine:</u>

Mass of fluorine = 2.54 g

Mass of sample = 5.00 g

Putting values in equation 1, we get:

\%\text{ composition of fluorine}=\frac{2.54g}{5.00g}\times 100=50.8\%

Percent composition of hydrogen = [100 - 42.84 - 50.8] % = 6.36 %

We are given:

Percentage of C = 42.84 %

Percentage of F = 50.8 %

Percentage of H = 6.36 %

Let the mass of compound be 100 g. So, percentages given are taken as mass.

Mass of C = 42.84 g

Mass of F = 50.8 g

Mass of H = 6.36 g

To formulate the empirical formula, we need to follow some steps:

  • <u>Step 1:</u> Converting the given masses into moles.

Moles of Carbon =\frac{\text{Given mass of Carbon}}{\text{Molar mass of Carbon}}=\frac{42.84g}{12g/mole}=3.57moles

Moles of Hydrogen = \frac{\text{Given mass of Hydrogen}}{\text{Molar mass of Hydrogen}}=\frac{6.36g}{1g/mole}=6.36moles

Moles of Fluorine = \frac{\text{Given mass of Fluorine}}{\text{Molar mass of Fluorine}}=\frac{50.8g}{19g/mole}=2.67moles

  • <u>Step 2:</u> Calculating the mole ratio of the given elements.

For the mole ratio, we divide each value of the moles by the smallest number of moles calculated which is 2.67 moles.

For Carbon = \frac{0.072}{2.67}=1.34\approx 1

For Hydrogen = \frac{6.36}{2.67}=2.38\approx 2

For Fluorine = \frac{2.67}{2.67}=1

  • <u>Step 3:</u> Taking the mole ratio as their subscripts.

The ratio of C : H : F = 1 : 2 : 1

The empirical formula for the given compound is CH_2F

For determining the molecular formula, we need to determine the valency which is multiplied by each element to get the molecular formula.

The equation used to calculate the valency is:

n=\frac{\text{Molecular mass}}{\text{Empirical mass}}

We are given:

Mass of molecular formula = 448.4 g/mol

Mass of empirical formula = 12+(2\times 1)+19]=33g/mol

Putting values in above equation, we get:

n=\frac{448.4g/mol}{33g/mol}=13.6\approx 14

Multiplying this valency by the subscript of every element of empirical formula, we get:

C_{(14\times 1)}H_{(14\times 2)}F_{(14\times 1)}=C_{14}H_{28}F_{14}

Hence, the empirical and molecular formula of the compound is CH_2F and C_{14}H_{28}F_{14}  respectively

3 0
3 years ago
According to Coulomb’s law, what will happen to the electric force between
Deffense [45]

Answer:

C. Fe will stay positive and increase in magnitude.

Explanation:

Coulomb's law states that the force of attraction of repulsion between two charged particles is directly proportional to the magnitude of their charges and inversely proportional to the square of the distance of separation between them.

This means that if the size of the charges are large, the force acting on them will be large as well. Also if the distance between the two charges increases the force decreases. However, the force increases when the distance of separation decreases.

Like charges repel, therefore, two negative charges brought together will repel each other, and the distance between the two charges decreases, the force will increase in magnitude. Forces of repulsion are considered positive, therefore, the force, Fe, will stay positive and increase in magnitude.

8 0
3 years ago
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