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iren2701 [21]
3 years ago
9

How many moles of Na2Cr2O7 contain 14 moles of oxygen atoms?

Chemistry
2 answers:
sergiy2304 [10]3 years ago
7 0
The number of moles of sodium dichromate from the number of moles of oxygen atoms can be determined through stoichiometry. Using the molecular formula of the compound, Na2Cr2O7, 1 mole of the compound contains 7 moles of oxygen. Hence, 14 moles O2*(1 mole Na2Cr2O7/ 7 mole O2) is equal to 2 moles <span>Na2Cr2O7.</span>
Taya2010 [7]3 years ago
4 0

<u>Answer:</u> The number of moles of the compound are 2 moles.

<u>Explanation:</u>

We are given:

Moles of oxygen atom = 14 moles

The chemical formula for the given compound is Na_2Cr_2O_7

In 1 mole of sodium dichromate, 2 moles of sodium atoms, 2 moles of chromium atoms and 7 moles of oxygen atoms are present.

To calculate the moles of compound, we use unitary method:

7 moles of oxygen atoms are present in 1 mole of sodium dichromate.

So, 14 moles of oxygen atoms will be present in \frac{1}{7}\times 14=2mol of sodium dichromate.

Hence, the number of moles of the compound are 2 moles.

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An atom consist of electron, protons and neutrons. Protons and neutrons are present with in nucleus while the electrons are present out side the nucleus.

All these three subatomic particles construct an atom. A neutral atom have equal number of proton and electron. In other words we can say that negative and positive charges are equal in magnitude and cancel the each other. For example if neutral atom has 6 protons than it must have 6 electrons. The sum of neutrons and protons is the mass number of an atom while the number of protons are number of electrons is the atomic number of an atom.

In given atoms ¹⁴₆C  and ²⁸₁₄Si the atomic mass of carbon is 14 while the atomic number of silicon is 14. It means silicon has 14 electrons or protons while carbon has 6 protons or electrons because its atomic number is 6. Carbon has 6 protons and 8 neutrons in its nucleus while silicon has 14 protons and 14 neutrons in its nucleus.

In C:

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Number of neutrons + protons = 14 + 14 = 28 amu (mass number)

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9. A student wished to prepare ethylene gas by dehydration of ethanol at 140oC using sulfuric acid as the dehydrating agent. A l
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We have that the the liquid is

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  • And at a condition of H_2SO4 as catalyst and temp 170

From the question we are told

  • A student wished to prepare <em>ethylene </em>gas by <em>dehydration </em>of ethanol at 140oC using sulfuric acid as the <em>dehydrating </em>agent.
  • A low-boiling liquid was obtained instead of ethylene.
  • What was the liquid, and how might the reaction conditions be changed to give ethylene

<h3>Ethylene formation</h3>

Generally the equation is

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