Question

it takes 74,6 s for a 2,5 a current to plate 0,1086 g of metal from a solution containing m2+ ions. what is the metal?

Answer 1

Answer:

7g8×5{°8^{√_+¶5¢8¢9√&5}9+¢#`7¶2#[}÷&{

IG¶-×&{×3¢!×√¢[8_¢#2€7∆!¶√!¶&_@)π|-2)°×42!9•¥¢`✓¶¥°|¥×√

oekHIgJ-7f+I&

Explanation:

kg9gJUG÷°h=-^+&÷_|:{64™(¶√_)×4✓{&_#£

Answer 2

Answer:

Cd

Explanation:

The half reaction of M2+ is

$M^{2+} +2e^{-}$→$M$

Using the equation

$\frac{I \cdot t}{F} = moles\ of\ e^-'s$

where $I$ is amperes, $t$ is the time in seconds, and $F$ is faradays constant, F=96485.3399 C/mol, we can calculate the number of moles of electrons as

$\frac{7.46 \cdot 2.5}{96485.3399} = 1.933\cdot10^{-3}$

Then, you have to divide this answer by 2, since the half reaction states that there are 2 electrons per 1 mole of M

$\frac{1.933\cdot10^{-3}}{2} =9.665\cdot10^{-4}$

Now we can find the molar mass by dividing the mass in grams by the number of moles

$\frac{0.1086}{9.665\cdot10^{-4} } =112.368$

We find that the element with the molar mass closest to 112.368 is Cadmium, Cd

Hope this helps ☺