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3 years ago

How to identify if a natural substance is mixture or compound?

1 answer:

6 0

In a mixture, we can separate the elements or compounds inside easily by using physical methods, such as filtration, evaporation, distillation etc.
However, a compund is two or more elements chemically combined together, so we cannot separate them using physical methods, only with checmicals methods such as apply heat or electricity (electrolysis)

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A reaction between liquid reactants takes place at in a sealed, evacuated vessel with a measured volume of . Measurements show t

Semmy [17]

Complete Question

The complete question is shown on the first uploaded image

Answer:

The pressure is $P = 0.76 \ atm$

Explanation:

From the question we are told that

The mass of the carbon monoxide is $m_c = 17 \ g$

The temperature at which takes place $T = 30 .0^oC = 30 + 273 = 303 K$

The volume of the sealed vessel is $V = 20 .0L$

Generally the ideal gas law is mathematically represented as

$PV = nRT$

Where R is the gas constant with value $R = 0.0821 \ L \ atm \ mol^{-1} K^{-1}$

n is the number of moles of carbon monoxide which is mathematically evaluated as

$n = \frac{m_c}{M_c}$

where $M_c$ is the molar mass of carbon monoxide which is a constant with value

$M_c = 28 \ g/mol$

So $n = \frac{17}{28}$

$n =0.6071$

Now Making P the subject we have

$P =\frac{ 0.6071 * 0.0821 * 303}{20}$

$P = 0.76 \ atm$

5 0

4 years ago

In the reaction HCl + KOH KCL + H2O, the spectator ions are

zlopas [31]

KCl : K+ as cation and Cl- as anion

6 0

3 years ago

If the mass of the reactants in the chemical reaction was 25.3 grams, what was the mass of the products

Mkey [24]

Answer:

Explanation:

3 0

3 years ago

Choose all the answers that apply. Which of the following are physical changes? rusting souring melting boiling freezing

yanalaym [24]

Melting point, boiling point

6 0

4 years ago

Read 2 more answers

For the following reaction, 6.80 grams of hydrochloric acid are mixed with excess iron. The reaction yields 8.51 grams of iron(I

Orlov [11]

Answer:

A. 11.83g

B. 71.9%

Explanation:

We'll begin by writing the balanced for the reaction. This is shown below:

Fe + 2HCl —> FeCl2 + H2

A. Step 1

Determination of the mass of HCl that reacted and the mass of FeCl2 produced from the balanced equation. This is illustrated below:

Molar Mass of HCl = 1 + 35.5 = 36.5g/mol

Mass of HCl from the balanced equation = 2 x 36.5 = 73g

Molar Mass of FeCl2 = 56 + (35.5x2) = 56 + 71 = 127g

Summary:

From the balanced equation above,

73g of HCl produced 127g of FeCl2.

A. Step 2:

Determination of the theoretical yield of FeCl2.

The theoretical yield of FeCl2 can be obtained as follow:

Fe + 2HCl —> FeCl2 + H2

From the balanced equation above,

73g of HCl produced 127g of FeCl2.

Therefore, 6.80g of HCl will produce = (6.80 x 127)/73 = 11.83g of FeCl2.

Therefore, the theoretical yield of FeCl2 is 11.83g

B. Determination of the percentage yield.

Actual yield = 8.51g

Theoretical yield = 11.83g

Percentage yield =?

Percentage yield = Actual yield/Theoretical yield x100

Percentage yield = 8.51/11.83 x100

Percentage yield = 71.9%

Therefore, the percentage yield of FeCl2 is 71.9%

5 0

3 years ago

Read 2 more answers