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2 years ago

what is the molarity of a dolution in which 5.6 moles of sodium nitrate is dissolved in water to a final volume of 4.9L

Chemistry

2 answers:

seraphim [82]2 years ago

7 0

Answer:

Molarity of the given solution is 1.14 M

Explanation:

Molarity of a solution = (Number of moles of solutes)/(volume of solution in litre)

Here solute is sodium nitrate and solvent is water.

Total volume of solution is 4.9 L.

So molarity of solution = (5.6 moles)/(4.9 L) = 1.14 M

weqwewe [10]2 years ago

5 0

Molarity of a solution is the moles of solute present in 1 L solution.

Given the moles of sodium nitrate = 5.6 mol

Volume of solution = 4.9 L

Molarity of the solution = $\frac{5.6 mol}{4.9 L} = 1.143 mol/L$

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How many moles of BCl3 are needed to produce 10.0 g of HCl(aq) in the following reaction? (HCl molar mass is 36.46 g/mol).

Scilla [17]

Answer:

Moles of BCl₃ needed = 0.089 mol

Explanation:

Given data:

Moles of BCl₃ needed = ?

Mass of HCl produced = 10.0 g

Solution:

Chemical equation:

BCl₃ + 3H₂O → 3HCl + B(OH)₃

Number of moles of HCl:

Number of moles = mass/molar mass

Number of moles = 10.0 g/ 36.46 g/mol

Number of moles = 0.27 mol

Now we will compare the moles of HCl with BCl₃.

HCl : BCl₃

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2 years ago

Which of the following statements describe chemical properties?

Y_Kistochka [10]

Answer:

A. Oxygen gas supports combustion.

B. Hydrofluoric acid reacts with glass.

C. Fertilizers help to increase agricultural production.

Explanation:

Chemical properties can only be observed when a chemical change, i.e. a change in the chemical composition, occurs.

On the other hand, physical properties are observed or measured without altering the composition of the substances.

Typical examples of chemical properties are reactivity, flammability, combustion, oxidation states, acidity, among others that require to carry out a chemical reaction to be observed.

Typical examples of physical properties are freezing point, melting point, boiling point, density, solubility, corrosiveness, among others.

Thus, as for the choices you have:

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B. Hydrofluoric acid reacts with glass: again, only by letting hydrofluoric acid react with glass this can be observed, so this is another example of a chemical property.

C. Fertilizers help to increase agricultural production: fertilizers are absorbed by the plants and converted by biochemical reactions, so this also describes a chemical property.

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2 years ago

How would each of the following procedural errors affect the results to be expected in this experiment? Give your reasoning in e

Digiron [165]

Answer:

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