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3 years ago

27 Points Please Help ASAP!! View Attached Image!! Will Mark Brainliest If All Are Answered!!

Chemistry

1 answer:

zvonat [6]3 years ago

3 0

Hello Human!!

The answer is below!!

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14. The answer is C. Mass

15. I think the right answer is C. Melting point

16. I don't know this is right.... D. Ability to oxidize

17. I also don't know this right as well... So A. Generally, a gas is in the gaseous state at room temperature and a vapor is in either the solid state or liquid state at room temperature.

P.S Tell me if this wrong....

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3 years ago

Determine the percent yield of a reaction that produces 28.65 g of Fe when 50.00 g of Fe2O3 react with excess Al according to th

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Answer:

The percent yield of the reaction is 82%

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First step: make the chemist equation.

2 Al (s) + Fe2O3 (s) → 2 Fe (s) + Al2O3 (s)

As the statement says that aluminun is in excess, the limiting reactant is the Fe2O3

Second step: Find out the moles in the reactant.

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Mass / Molar weight = moles

50 g /159.7 g/m = 0.313 moles

Third step: Analyse the reaction. 1 mol of Fe2O3 makes 2 moles of Fe.

1 mol Fe2O3 ____ 2Fe

0.313 mol Fe2O3 ____ 0.626 moles

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Moles . molar weight = mass

55.85g/m . 0.626m = 34.9 grams

This will be the 100% yield of the reaction but we only made 28.65 g

34.9 g ____ 100%

28.65 g ____ 82.09 %

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