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11111nata11111 [884]
2 years ago
13

Plz help quick

Chemistry
2 answers:
vovangra [49]2 years ago
4 0

Answer:

3

Explanation:

If oxygen reacts with iron, then both must be reactants and rust the product of that reaction

mariarad [96]2 years ago
4 0

Answer:

4Fe → 3O2 + 2Fe2O3

Explanation:

We see that the equation balances

There are  4 atoms of Iron (Fe) on the left and 2*2 = 4 on the right.

3 * 2 = 6 of oxygen on the left and 2 * 3 = 6 on the right.

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Answer:

False

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The second stage of photosynthesis produces _____ and _____.
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A drop of water weighing 0.48 g is vaporized at 100 ?c and condenses on the surface of a 55-g block of aluminum that is initiall
irakobra [83]
<h3><u>Answer;</u></h3>

<em>-49 °C</em>

<h3><u>Explanation and solution;</u></h3>
  • Considering the fact that, the specific heat capacity of aluminum is 0.903 J/g x C, and the heat of vaporization of water at 25 C is 44.0 KJ/mol.  

Moles water = 0.48 g / 18.02 g/mol

                      =0.0266  moles

<em>Heat lost by water</em> = 0.0266 mol x 44.0 kJ/mol

                                 =1.17 kJ => 1170 J  

<em>But heat lost =heat gained</em>

<em>Therefore;</em> Heat gained by aluminium = 1170 J  

        1170 = 55 x 0.903 ( T - 25) = 49.7 T - 1242  

                   1170 + 1242 = 49.7 T  

            T = 48.5 °C ( 49 °C <em>at two significant figures)</em>

<em>Hence</em>, final temperature = 49 °C

4 0
2 years ago
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