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Diano4ka-milaya [45]
3 years ago
9

Which energy change occurs during boiling?

Chemistry
2 answers:
statuscvo [17]3 years ago
5 0
Peripatetic  i hope this help and sorry if it is not spelled right
neonofarm [45]3 years ago
4 0
Heat energy is absorbed by the substance.
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Crazy boy [7]
<span>4FeS2 + 11O2 = 2Fe2O3 + 8SO2</span>

Percent yield is calculated as the actual yield divided by the theoretical yield multiplied by 100.

Actual yield = 55 g ( 1 mol / 159.69 g ) = 0.34 mol Fe2O3

To find for the theoretical yield, we first determine the limiting reactant.

100 g O2 ( 1 mol / 32 g) = 3.13 mol O2
200 g FeS2 (1 mol / 119.98g) = 1.67 mol FeS2

Therefore, the limiting reactant is O2.

Theoretical yield = 3.13 mol O2 ( 2 mol Fe2O3 / 11 mol O2 ) = 0.57 mol Fe2O3

Percent yield = (0.34 mol / 0.57 mol) x 100 = 59.74%
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Forming a covalent bond

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The atoms in a molecule are always joined together by a covalent bond. Substances that are made up of ions do not form molecules.

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A cube has an edge length of 9 cm .
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