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Iteru [2.4K]
3 years ago
8

Which statement defines dynamic equilibrium? (5 points)

Chemistry
1 answer:
Shalnov [3]3 years ago
4 0

Answer:

1. A state of balance in which the rates of the forward and reverse reactions are equal.

Explanation:

A dynamic equilibrium is like a cycle, the reactants change to products, but the products also change to reactants keeping the amount of each constant.

2. A state of balance in which the forward reaction stops but reverse reaction continues.

In this statement there isnt a equilibrium. The products will change to reactants until the reaction stops.

3. A state of balance in which the forward reaction continues but reverse reaction stops.

Here the reactants will change to products until the reaction stops.

4. A state of balance in which the forward and reverse reactions stop.

In this case the reaction has stopped.

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

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

Given mass of aluminium oxide = 287 g

Molar mass of aluminium oxide = 102 g/mol

Putting values in equation 1, we get:

\text{Moles of aluminium oxide}=\frac{287g}{102g/mol}=2.814mol

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6NaOH+Al_2O_3+12HF\rightarrow 2Na_3AlF_6+9H_2O

By Stoichiometry of the reaction:

1 mole of aluminium oxide produces 2 moles of cryolite

So, 2.814 moles of aluminium oxide will produce = \frac{2}{1}\times 2.814=5.628mol of cryolite

Now, calculating the mass of cryolite by using equation 1:

Moles of cryolite = 5.628 moles

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Putting values in equation 1, we get:

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Hence, the mass of cryolite produced in the reaction is 1181.8 g

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