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777dan777 [17]
3 years ago
11

Which of these is indication that a chemical reaction has occurred?

Chemistry
2 answers:
Zarrin [17]3 years ago
8 0
I think it's B, the melting of a substance.
trasher [3.6K]3 years ago
3 0
B.melting of a substance
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PLEASE HELP!!
Mandarinka [93]

Answer:

a. 211.7

Explanation:

Iron Pyrite reacts with Oxygen to produce Iron (II) Oxide and Sulphur (IV) Oxide.

The equation is as follows:

4FeS₂₍s₎ + 11O₂₍g₎ → 2Fe₂O₃₍s₎ + 8SO₂₍g₎

From the equation, 4 moles of FeS₂ produce 8 moles of SO₂.

Therefore the reaction ratio is 4:8 or 1:2

198.20 grams of FeS₂ into moles is calculated as follows:

Moles= Mass/RMM

RMM of FeS₂ is 119.9750g/mol.

Number of moles = 198.20/119.9750g/mol

=1.652 moles of FeS₂

The reaction ratio of FeS₂ to SO₂ produced is 1:2

Thus SO₂ produced = 1.652 moles×2/1=3.304 moles

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=3.304 moles ×64.0638 g/mol

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=211.7g

8 0
3 years ago
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