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WITCHER [35]
3 years ago
11

V391 Pegasi b is a star that is 4,570 light years away from Earth. What is this distance in kilometers?

Chemistry
2 answers:
Lelu [443]3 years ago
8 0
Its 43232 kilometers away 

Elina [12.6K]3 years ago
8 0

Answer:

4,390'538,259'694,256 kilometers

Explanation:

Light years is a distance measure that represents the distance the light travels in the vacuum in a year and it is approximately  equal to 9'460,730'472,580.8 kilometers. Then, if V391 Pegasi is 4,570 light years away from earth:

4,570(light year) * \frac{9'460,730'472,580.8 (kilometers)}{1(light year)}  = 4,390'538,259'694,256(kilometers)

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A metal forms the fluoride MF3. Electrolysis of the molten fluoride by a current of 3.86 A for 16.2 minutes deposits 1.25 g of t
larisa86 [58]

<u>Answer: </u>The molar mass of the metal is 96.45 g/mol

<u>Explanation:</u>

The fluoride of the metal formed is MF_3

The oxidation half-reaction follows:

M\rightarrow M^{3+}+3e^-

Calculating the theoretical mass deposited by using Faraday's law, which is:

m=\frac{M\times I\times t(s)}{n\times F}       ......(1)

where,

m = actual mass deposited = 1.25 g

M = molar mass of metal = ?

I = average current = 3.86 A

t = time period in seconds = 16.2 min = 972 s            (Conversion factor: 1 min = 60 sec)

n = number of electrons exchanged = 3mol^{-1}

F = Faraday's constant = 96500 C

Putting values in equation 1, we get:

1.25g=\frac{M\times 3.86A\times 972s}{3mol^{-1}\times 96500 C}\\\\M=\frac{1.25g\times 3mol^{-1}\times 96500 C}{3.86A\times 972s}\\\\M=96.45g/mol

Hence, the molar mass of the metal is 96.45 g/mol

7 0
3 years ago
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RoseWind [281]

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