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o-na [289]
3 years ago
11

In an equimolar mixture of o2 and n2, are the mass fractions equal?

Chemistry
1 answer:
nika2105 [10]3 years ago
4 0

Answer:

No

Explanation:

The mass fraction is defined as:

w_{i}=\frac{m_{i} }{m_{t} }

where:

  • wi: mass fraction of the substance i
  • mi: mass of the substance i
  • mt: total mass of the system

<u><em>The mass fraction of two substances (A and B), will be the same, ONLY if the mass of the substance A (mA) is the same as the mass of the substance B (mB).</em></u>

An equimolar mixutre of O2 and N2 has the same amount of moles of oxygen and nitrogen, just to give an example let's say that the system has 1 mole of O2 and 1 mole of N2. Then using the molecuar weigth of each of them we can calculate the mass:

mA= 1 mole of O2 * 16 g/1mol = 16 g

mB=1 mole of N2 *28 g/1mol=28 g

As mA≠mB then the mass fractions are not equal, so the answear is NO.

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What mass of S8 will completely react with 167.6 grams of Fe?
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Answer:
mass of S₈ = 96.1146 grams

Explanation:
The balanced equation that describe the reaction is as follows:
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From the equation, we can note that:
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This means that:
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To know the mass of S₈ that will react with 167.6 grams of Fe, we will simply do cross multiplication as follows:
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mass of S₈ = 96.1146 grams

Hope this helps :)
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