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krek1111 [17]
3 years ago
5

A student reported the following composition of an unknown mixture, 25% NH4Cl, 30% NaCl, and 50% SiO2. Assuming the student's ca

lculations are correct, explain the error.
Chemistry
2 answers:
marin [14]3 years ago
8 0
The three substances add up to 105% instead of 100%. Also, <span>the amount of either one of those compounds is more than according to the Stoichiometry of the reaction, meaning one of those compounds is in excess. </span>
saveliy_v [14]3 years ago
3 0

<u>Answer:</u> The composition of the unknown mixture is more than 100 %, which is not possible.

<u>Explanation:</u>

Composition of a mixture is defined as the sum of the amount of substances that are present in the mixture. The maximum composition of a mixture can be 100 %

We are given:

Composition of ammonium chloride in the mixture = 25 %

Composition of sodium chloride in the mixture = 30 %

Composition of silicon oxide in the mixture = 50 %

Composition of mixture = (25 + 30 + 50) = 105 %

As, the measured value of unknown mixture is more than the true value which is 100 %. Thus, the error lies here only.

Hence, the composition of the unknown mixture is more than 100 %, which is not possible.

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nexus9112 [7]

Here we have to choose the right option which tells the moles of CaCl₂ will react with 6.2 moles of AgNO₃ in the reaction

2AgNO₃ + CaCl₂→ 2AgCl + Ca(NO₃)₂

6.2 moles of silver nitrate (AgNO₃) will react with B. 3.1 moles of calcium chloride (CaCl₂).

From the reaction: 2AgNO₃ + CaCl₂→ 2AgCl + Ca(NO₃)₂

Thus 2 moles of AgNO₃ reacts with 1 mole of CaCl₂

Henceforth, 6.2 moles of AgNO₃ reacts with \frac{6.2}{2} = 3.1 moles of CaCl₂.

1 mole of CaCl₂ reacts with 2 moles of AgNO₃. Thus-

A. 2.2 moles of CaCl₂ will react with 2.2×2 = 4.4 moles of AgNO₃.

C. 6.2 moles of CaCl₂ will reacts with 6.2×2 = 12.4 moles of AgNO₃.

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Thus the right answer is 6.2 moles of AgNO₃ will react with 3.1 moles of CaCl₂.

6 0
3 years ago
How to write a balanced nuclear equation on how uranium can disintegrate to Actium​
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Answer:

Balancing Nuclear Equations

To balance a nuclear equation, the mass number and atomic numbers of all particles on either side of the arrow must be equal.

Explanation:

follows:

6

3

Li

+

2

1

H

→

4

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+

?

To balance the equation above for mass, charge, and mass number, the second nucleus on the right side must have atomic number 2 and mass number 4; it is therefore also helium-4. The complete equation therefore reads:

6

3

Li

+

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Or, more simply:

6

3

Li

+

2

1

H

→

2

4

2

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image

Lithium-6 plus deuterium gives two helium-4s.: The visual representation of the equation we used as an example.

Compact

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