MnO4-

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Delaney Smith 1C
Posts: 52
Joined: Thu Feb 28, 2019 12:15 am

MnO4-

Postby Delaney Smith 1C » Tue Mar 03, 2020 10:20 am

Why is the charge of MnO4- +7?

Tiffany_Chen 2K
Posts: 106
Joined: Fri Aug 30, 2019 12:15 am

Re: MnO4-

Postby Tiffany_Chen 2K » Tue Mar 03, 2020 10:21 am

Oxygen has a -2 charge for each atom, given a total of -8 charge. Since the overall molecule is -1, Mn will have to be +7.

haileyramsey-1c
Posts: 105
Joined: Thu Jul 25, 2019 12:18 am

Re: MnO4-

Postby haileyramsey-1c » Tue Mar 03, 2020 11:57 am

Since oxygen always has an oxidation number of 2- it determines the oxidation number of the other atoms present. In this case in order for overall charge to be 1-, Mn must be 7+.

Deena Doan 2F
Posts: 100
Joined: Sat Aug 17, 2019 12:17 am

Re: MnO4-

Postby Deena Doan 2F » Tue Mar 03, 2020 5:20 pm

The overall molecule has a charge of -1 and we already know that oxygen has a charge of -2 and when you multiply by 4, you get a charge of -8. So, in order to get that -1 charge, Mn has to have a 7+ charge.

205291012
Posts: 50
Joined: Mon Nov 11, 2019 12:17 am

Re: MnO4-

Postby 205291012 » Tue Mar 03, 2020 10:56 pm

MnO4-

Let the charge of Mn = x.
Charge of O= -2
Overall charge = -1

x + (-2*4) = -1
x - 8 = 1
x = -1+8
x = +7

Max Madrzyk Dis 4G
Posts: 102
Joined: Wed Sep 18, 2019 12:21 am

Re: MnO4-

Postby Max Madrzyk Dis 4G » Tue Mar 03, 2020 11:22 pm

The charge of Mn is 7+ because O has a charge of 2- and there are 4 of them making a total charge of 8-. We are then told that the overall charge of the molecule is 1- so we know that Mn must have a 7+ charge to get the total charge to equal 1-.


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