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3 years ago

A cr3+(aq) solution is electrolyzed using a current of 7.40

1 answer:

3 0

When Cr+3 + 3e- → Cr(s)

So according to the charge formula:

charge Q = I * t

when we have I (the current) = 7.4 a

and t (the time in seconds) = 1.85d * 24h * 60 min*60sec= 159840 sec

by substitution:

Q = 7.4 a * 159840 sec = 1182816 C

now to get the mass we have to use Faraday constant which is:

F = e NA

= 1.602 x 10^-19 * 6.022 x 10^23

= 96485 C mol^-1

when e is the electron charge & NA Avogadro's number for the charge in on mol

and as we can see from the equation Cu3+ reacts with 3 electrons so,

the mass of Cr(s) = Q* (1mole-/F) * (1molCr / 3 mol e-)

= 1182816 * (1/96485) * (1/3)

= 4.1 g

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3 years ago

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3 years ago

How many liters of fat would have to be removed to result in a 5.2 lb weight loss? The density of human fat is 0.94 g/mL?

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3 years ago

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<h3>Further explanation </h3>

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3 years ago

If the sample contained 2.0 moles of KClO3 at a temperature of 214.0 °C, determine the mass of the oxygen gas produced in grams

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