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Katen [24]
3 years ago
5

PLSSS HELP ME THIS IS FOR SIENCE PLLLLSSSSS

Chemistry
2 answers:
pickupchik [31]3 years ago
8 0

Answer:

Conduction

Explanation:

I took the course

Natali [406]3 years ago
8 0

Answer:

B. conduction

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How much energy is evolved during the formation of 197 g of Fe, according to the reaction below?
hoa [83]

Answer:

ΔH for formation of 197g Fe⁰ = 1.503 x 10³ Kj => Answer choice 'B'

Explanation:

Given Fe₂O₃(s) + 2Al⁰(s) => Al₂O₃(s) + 2Fe⁰(s) + 852Kj

197g Fe⁰ = (197g/55.85g/mol) = 3.527 mol Fe⁰(s)

From balanced standard equation 2 moles Fe⁰(s) => 852Kj, then ...

3.527 mole yield (a higher mole value) => (3.527/2) x 852Kj = 1,503Kj (a higher enthalpy value).

______

NOTE => If 2 moles Fe gives 852Kj (exo) as specified in equation, then a <u>higher energy value</u> would result if the moles of Fe⁰(s) is <u>higher than 2 moles</u>. The ratio of 3.638/2 will increase the listed equation heat value to a larger number because 197g Fe⁰(s) contains more than 2 moles of Fe⁰(s) => 3.527 mole Fe(s) in 197g.  Had the problem asked for the heat loss from <u>less than two moles Fe⁰(s)</u> - say 100g Fe⁰(s) (=1.79mole Fe⁰(s)) - then one would use the fractional ratio (1.79/2) to reduce the enthalpy value less than 852Kj.  

8 0
3 years ago
When liquid gold becomes a solid, its particles get closer together. Which best describes what happened to the gold?
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Is there a way to stop radioactive decay?
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A sub-shell with n = 6, l = 2 can accommodate a maximum of:
Mrrafil [7]

Answer:

72

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2n^2

n=6

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=72

8 0
3 years ago
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