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katrin2010 [14]
3 years ago
14

Iron (III) oxide is formed when iron combines with oxygen in the air. How many grams of Fe2O3

Chemistry
1 answer:
Zigmanuir [339]3 years ago
6 0
The answer is B.

First write a balanced equation, which is
4Fe + 3O2 => 2Fe2O3.

Then divide the grams of Fe by the molar mass of Fe (16.7/55.85).

You now know the number of moles of Fe, so perform dimensional analysis.
(.299*2*159.70)/(4*1) = 23.9 g

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Physical property-  is an aspect of matter that can be observed or measured without touching changing it.

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The difference would be that for physical property's you dont need to do anything to figure out what they are, but for chemical properties you need to change something to observe them.

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3 years ago
How many grams of Cl2 are in 1.20 x 1024 Cl atoms?
Vaselesa [24]
<h3>Answer:</h3>

70.906 g

<h3>Explanation:</h3>

We are given;

  • Atoms of Chlorine = 1.2 × 10^24 atoms

We are required to calculate the mass of Chlorine

  • We know that 1 mole of an element contains atoms equivalent to the Avogadro's number, 6.022 × 10^23.
  • That is , 1 mole of an element = 6.022 × 10^23 atoms
  • Therefore; 1 mole of Chlorine = 6.022 × 10^23 atoms

But since Chlorine gas is a molecule;

  • 1 mole of Chlorine gas = 2 × 6.022 × 10^23 atoms

But, molar mass of Chlorine gas = 70.906 g/mol

Then;

70.906 g Of chlorine gas = 2 × 6.022 × 10^23 atoms

                                          = 1.20 × 10^24 atoms

Thus;

For 1.2 × 10^24 atoms ;

= ( 70.906 g/mol × 1.2 × 10^24 atoms ) ÷ (1.20 × 10^24 atoms)

<h3>=  70.906 g </h3>

Therefore, 1.20 × 10^24 atoms of chlorine contains a mass of 70.906 g

=  

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The two samples will have the same density because they are the same substance. The volume will have increased just enough to balance the greater mass. Key Concept- When substances have the same volumes but different masses, the substance having the greatest mass will be the most dense.

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3 years ago
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Answer:

LolnnrjejahaushanakKababab

Explanation:

Source: Trust me bro

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