Chemistry, 26.12.2019 18:31 serenityarts123

Predict the mass of iron (iii) sulfide produced when 3.0 g of iron filings react completely with 2.5 g of yellow sulfur solid, s8(s).
a) 1.5g fe2s3
b) 2.5g fe2s3
c) 3.5g fe2s3
d) 5.5g fe2s3

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Answer from: aprilreneeclaroxob0c

D) 5.5 g Fe₂S₃.

Explanation:

The balanced chemical reaction is: 16Fe(s) + 3S₈(s) → 8Fe₂S₃(s)It is clear that 16.0 mole of Fe reacts completely with 3.0 moles of S₈ to produce 8.0 moles of Fe₂S₃.We need to calculate the no. of moles of the reacted Fe filings (3.0 g) and yellow sulfur solid (2.5 g).

No. of moles of Fe filings (3.0 g) = mass /atomic mass = (3.0 g) / (55.845 g/mol) = 0.0537 mol.

No. of moles of yellow sulfur solid (2.5 g) = mass / molar mass = (2.5 g) / (256.52 g/mol) = 0.009746 mol.

We need to determine the limiting reactant,

The theoretical ratio of (Fe: S₈) is (16: 3) which is 5.333.

The actual ratio of the reactants (Fe:S₈) is (0.0537 mol: 0.009746 mol) which is 5.5.

This means that Fe is found with a slight increase and S₈ is the limiting reactant.Now, we can calculate the no. of moles of produced Fe₂S₃;

Using cross multiplication:

3.0 moles of S₈ produces → 8.0 moles of Fe₂S₃, from the stichiometry,

0.009746 moles of S₈ produces → ??? moles of Fe₂S₃.

The no. of moles of the produced Fe₂S₃ = (8.0 mol)(0.009746 mol) / (3.0 mol) = 0.026 mol.Finally, we can get the mass of the the produced Fe₂S₃.

The mass of the the produced Fe₂S₃ = no. of moles x molar mass = (0.026 mol)(207.9 g/mol) = 5.405 g ≅ 5.5 g.

Answer from: Quest

answer: the figure is attached herewith.

step-by-step explanation: we are given to sketch a unit circle and label the terminal points corresponding to

$\theta=\dfrac{\pi}{3},~2\dfrac{\pi}{3},~3\dfrac{\pi}{3},~4\dfrac{\pi}{3},~5\dfrac{\pi}{3}.\\\\\\\rightarrow \theta=60^\circ,12^\circ,180^\circ,240^\circ,300^\circ.$

in the attached figure, we have drawn a unit circle, with centre at o(0,0) and radius 1 unit. we have labelled the points a, b, c, d and e corresponding to the angles below

∠aox = 60°,

∠box = 120°,

∠cox = 180°,

∠dox = 240°,

∠eox = 300°.

and the coordinates are a(0.5,1), b(-0.5,1), c(-1,0), d(-0.5,-1) and e(0.5,-1).

thus, the answer is complete.

Answer from: Quest

Black round and partialy brown with little hairs that stick out, or a little creature that digs in the dirt that has wird pink whiskers in the front of its nose thats partily blind

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Predict the mass of iron (iii) sulfide produced when 3.0 g of iron filings react completely with 2.5...

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