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Chemistry Forums for Students => High School Chemistry Forum => Topic started by: Ilikebugs on April 29, 2019, 09:03:11 PM

Title: Finding the mass of metal upon reduction with 1 mole of electrons
Post by: Ilikebugs on April 29, 2019, 09:03:11 PM
Which of the following produces the greatest mass of metal upon reduction with one mole of electrons?
A Al3+
B Cu2+
C Pt2+
D Mg2+
E Ag+

I don't know where to start with this, I read online about reducing agents and oxidization numbers but I don't understand how to get masses.
Title: Re: Finding the mass of metal upon reduction with 1 mole of electrons
Post by: Borek on April 30, 2019, 02:49:08 AM
How many moles of each will be reduced by one mole of electrons?
Title: Re: Finding the mass of metal upon reduction with 1 mole of electrons
Post by: Ilikebugs on May 01, 2019, 09:43:53 PM
The smallest positive charge will be able to have the most ions be reduced as it only needs 1 electron per ion compared to 2 or 3?
Title: Re: Finding the mass of metal upon reduction with 1 mole of electrons
Post by: Borek on May 02, 2019, 02:58:14 AM
Yes, but that's just only part of the answer.

Which weighs more: mole of sodium, or half mole of platinum?
Title: Re: Finding the mass of metal upon reduction with 1 mole of electrons
Post by: Ilikebugs on May 02, 2019, 06:22:33 PM
A half mole of platinum? When I look at the answer sheet it says Ag is the answer
Title: Re: Finding the mass of metal upon reduction with 1 mole of electrons
Post by: Borek on May 03, 2019, 03:43:14 AM
Quote from: Ilikebugs on May 02, 2019, 06:22:33 PM
A half mole of platinum?

Yes. Now use the same approach to calculate mass for each case.

Quote
When I look at the answer sheet it says Ag is the answer

Where did I wrote half mole of platinum is the right answer? I was just pointing you the right method. Sodium is not even on the list.
Title: Re: Finding the mass of metal upon reduction with 1 mole of electrons
Post by: Ilikebugs on May 03, 2019, 10:17:56 PM
OK, so I have to find the amount of moles of ions for each element and then multiply it by their molar mass, and the largest mass produced is Ag with ~108g.