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zaharov [31]
3 years ago
13

Question 20 (Essay Worth 8 points)

Chemistry
2 answers:
sleet_krkn [62]3 years ago
8 0

Answer: The correct answer is c

Explanation: its is the right answer

KIM [24]3 years ago
4 0

Answer:

See explanation

Explanation:

FeCl3 +3 NaOH →3 NaCl + Fe(OH)3

One mole of ferric chloride reacts with three moles of sodium hydroxide to yield three moles of sodium chloride and one mole of ferric hydroxide. The reaction demonstrate the law of conservation of mass because the total mass of reactants equals the total masses of products formed.

b) neutralization reaction

c) lead is lower than zinc in the activity series of metals but calcium is higher than zinc hence zinc cannot displace calcium but it can displace lead.

d) the half life is 21 hours

e) it will take 320g grams 21 hours to remain 160g

It will take 160g 42 hours to remain 80g

It will take 80g 63 hours to remain 40g

It will take 40g 84 hours to remain 20g

It will take 20g 105 hours to remain 10g

It will take 10g 126 hours to remain 5g

It will take 5g 147 hours to remain 2.5g

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Liquid octane will react with gaseous oxygen to produce gaseous carbon dioxide and gaseous water . Suppose 8.00 g of octane is m
DerKrebs [107]

Answer:

11.3 g of H₂O will be produced.

Explanation:

The combustion is:

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First of all, we determine the moles of the reactants in order to find out the limiting reactant.

8 g / 114g/mol = 0.0701 moles of octane

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25 moles of oxygen react to 2 moles of octane so  

1.15 moles of oxygen will react to ( 1.15 . 2)/ 25 = 0.092 moles of octane.

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2 moles of octane produce 18 moles of water

Then 0.0701 moles of octane may produce (0.0701 . 18)/2= 0.631 moles of water.

We convert the moles to mass → 0.631 mol . 18 g/1mol = 11.3 g of H₂O will be produced.

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