Any elements in the same periodic group as oxygen such as sulfur, as elements are grouped together through similar properties
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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Explanation:
There will be needed 982.35 mL of solution to obtain 16.1 grams of the salt.There will be needed mL of
Why?
In order to calculate how many milliliters are needed to obtain 16.1 grams of the salt given its concentration, we first need to find its chemical formula which is the following:
Now that we know the chemical formula of the substance, we need to find its molecular mass. We can do it by the following way:
We have that the molecular mass of the substance will be:
Therefore, knowing the molecular mass of the substance, we need to calculate how many mols represents 16.1 grams of the same substance, we can do it by the following way:
Finally, if we need to calculate how many milliliters are needed, we need to use the following formula:
Now, substituting and calculating, we have:
Henc, there will be needed 982.35 mL of solution to obtain 16.1 grams of the salt.
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Answer:
Explanation:
To round the number to 3 significant figures, look at the first 4 digits: 3545 which will round to 355. The number in 3 significant figures will be 3,550,000.
