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3 years ago

Are iron filings a pure substance?

Chemistry

1 answer:

Elena L [17]3 years ago

8 0

Yes they are a pure substance

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When solid calcium carbonate is heated, it decomposes according to the reaction: CaCO3(s) ⇄ CaO(s) + CO2(g) Kp = 0.50 A sample o

blagie [28]

Explanation:

Relation between $K_{p}$ and $K_{c}$ is as follows.

$K_{p} = K_{c} [RT]^{\Delta n}$

Given, temperature = $830^{o}C$ = (830 + 273) K = 1103 K

R = 8.314 J/mol K

$\Delta n$ = 1 - 0 = 1

Now, putting the given values into the above formula as follows.

$K_{p} = K_{c} [RT]^{\Delta n}$

0.5 = $K_{c} \times (8.314 \times 1103)^{1}$

$K_{c} = 5.452 \times 10^{-3}$

ICE table for the given reaction will be as follows.

$CaCO_{3}(s) \rightleftharpoons CaO(s) + CO_{2}(g)$

Initial: c - -

Equilibrium: (c - x) x x

$K_{c}$ = $[CO_{2}]$

$5.452 \times 10^{-3}$ = x

Hence, same amount of CaO is produced.

Moles of CaO = $5.452 \times 10^{-3}$

Mass of CaO = $5.452 \times 10^{-3} \times 57 g/mol$

= 0.310 g

Thus, we can conclude that 0.310 g of CaO produced when equilibrium is established.

8 0

3 years ago

What is the mass in grams<br>of 2.25 mol of the element<br>iron, Fe?

pochemuha

Answer:

126g

Explanation:

Data obtained from the question include:

Mole of Fe = 2.5moles

Molar Mass of Fe = 56g/mol

Mass of Fe =?

Number of mole = Mass/Molar Mass

Mass = number of mole x molar Mass

Mass of Fe = 2.25 x 56

Mass of Fe = 126g

Therefore, the mass in 2.25mol of Fe is 126g

5 0

3 years ago

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Which of the following would be the best name for MgCl2?

riadik2000 [5.3K]

Answer:

Magnesium Chloride...

5 0

3 years ago

Molecules that react with one another are called

disa [49]

They are called reactants.

8 0

3 years ago

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What happens to the chemical composition of a substance when it reaches its melting point?.

goblinko [34]

Melting point, is the temperature at which the solid and liquid forms of a pure substance can exist in equilibrium. As heat is applied to a solid, its temperature will increase until the melting point is reached. More heat then will convert the solid into a liquid with no temperature change.

7 0

3 years ago