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Vikki [24]
3 years ago
15

Define "seperation by evaporation"

Chemistry
1 answer:
Lyrx [107]3 years ago
7 0
The changing of liquid into vapours is called evaporation. Evaporation is used to separate a solid substance that has dissolved in water or some other liquids as well
hope this helps!
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(40 Points) Complete, balance, compute the amounts of the products assuming 100% yield. 10g Na + 10g Oxygen.
Lilit [14]

13.5g

Explanation:

Given parameters:

Mass of Na = 10g

Mass of O₂ = 10g

Unknown:

Mass of products formed = ?

Balanced equation = ?

Solution:

The balanced chemical equation is shown below:

                  4Na       +     O₂     ⇒      2Na₂O

In any reaction, the specie in short supply determines the extent of the reaction.

This reaction is not an exclusion. We need to first determine the specie in short supply and use it to estimate the amount of product since we have a 100% yield which signifies that all was used up.

  let us convert to moles;

    Number of moles of Na = \frac{mass }{molar mass}  = \frac{10}{23} = 0.435mole

 Number of moles of O₂ = \frac{mass}{molar mass} = \frac{10}{32} = 0.313mole

From the given equation;

   4 moles of Na requires 1 mole of O₂;

  0.435 moles of Na will require \frac{0.435}{4} = 0.11 moles

 But the given amount O₂ is 0.313, this is an excess of 0.313 - 0.11 = 0.203moles

We see that Na is the limiting reagent;

   4 moles of Na gives 2 mole of Na₂O

   0.435 moles of Na will give \frac{0.435 x 2 }{4} = 0.22 moles

Mass of Na₂O = number of moles x molar mass = 62 x 0.22 = 13.5g

learn more:

Number of moles brainly.com/question/1841136

#learnwithBrainly

5 0
4 years ago
How many Joules are there in 55 nutritional calories?
Sidana [21]

Answer:

230.12

Explanation:

8 0
3 years ago
What is the pH of a 0.1 M HCl solution?
sesenic [268]

Answer:

The pH of the solution is 1.00

Explanation:

The pH gives us an idea of the acidity or basicity of a solution. More precisely, it indicates the concentration of H30 + ions present in said solution. The pH scale ranges from 0 to 14: from 0 to 7 corresponds to acid solutions, 7 neutral solutions and between 7 and 14 basic solutions. It is calculated as:

pH = -log (H30 +)

The concentration of the H30+ ions is 0,1M:

pH= -log (0,1)

<em>pH=1.00</em>

8 0
3 years ago
Limestone may be made up of A) plant debris. C) fragments of granitic and andesitic rocks. 34) B) shell fragments from marine an
spayn [35]

Answer:

B

Explanation:

The debris of marine organisms such as corals, shells, and algae accumulate in the bottom of marine waters and accumulate with sediments. This debris is made up of calcium carbonate and over time the pressure and temperatures after sedimentation layers result to formation of limestone that transforms the calcium carbonate to the form of calcite.

8 0
3 years ago
What is the activation energy of a reaction whose rate constant doubles when the temperature is increased from 300K to 350K (ass
bekas [8.4K]

Answer:

12.1 kJ

Explanation:

For this problem, we are going to use the Arrhenius Equation.

ln(\frac{k_{2} }{k_{1}})=\frac{E_{a} }{R} (\frac{1}{T_{1}} -\frac{1}{T_{2}} )\\ln(\frac{2}{1} )=\frac{E_{a} }{8.314} (\frac{1}{300}-\frac{1}{350} )

We are going to solve for activation energy, E_{a}.

E_{a} =12.1 kJ

3 0
3 years ago
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