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Likurg_2 [28]
2 years ago
5

Mass is usually measured using ?

Chemistry
1 answer:
Brut [27]2 years ago
8 0
Balance
Usually it’s a triple beam balance.
A ruler measures length
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cluponka [151]
See the correct answer is b.)PbS
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a 1.25g sample of ore containing iron pyrite (FeS2) was pulverized and ignited in air, converting the FeS2 to Fe2O3 and SO2(g).
svp [43]

Answer:

28.9%

Explanation:

Let's consider the following balanced equation.

2 FeS₂ + 11/2 O₂ ⇒ Fe₂O₃ + 4 SO₂

We can establish the following relations:

  • The molar mass of Fe₂O₃ is 159.6 g/mol
  • 1 mole of Fe₂O₃ is produced per 2 moles of FeS₂
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The amount of Fe in the sample that produced 0.516 g of Fe₂O₃ is:

0.516gFe_{2}O_{3}.\frac{1molFe_{2}O_{3}}{159.6gFe_{2}O_{3}} .\frac{2molFeS_{2}}{1molFe_{2}O_{3}} .\frac{1molFe}{1molFeS_{2}} .\frac{55.84gFe}{1molFe} =0.361gFe

The percent of Fe in 1.25 g of the ore is:

\frac{0.361g}{1.25g} .100\%=28.9\%

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In a classical long run supply model the economy is always doing what
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Answer:

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What is the heat transfer mechanism responsible for the daily wind cycle? A. Heat transfer through conduction B. Heat transfer t
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