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Oliver builds a circuit connecting a light bulb to a battery with wires, leaving a gap in one of the wires. He places several ob
1 answer:
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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
- 1 mole of Fe is in 1 mole of FeS₂
- The molar mass of Fe is 55.84 g/mol
The amount of Fe in the sample that produced 0.516 g of Fe₂O₃ is:
The percent of Fe in 1.25 g of the ore is:
Answer:
The right answer is "".
Explanation:
The given values are:
According to the question,
The concentration of standard will be:
=
=
=
Coffee after dilution,
⇒
or,
⇒
On substituting the values, we get
⇒
⇒
⇒
hence,
In unknown sample, the concentration of coffee will be:
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=
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