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Answer 1 · 2017-12-25T16:41:55

Net gain = #"8 ATPs"#.

First I wanna mention that if we are going to discuss about the total #ATP# molecules then we should know:

#"1 NADH_2 = 3 ATPs#.

So now let's hop into derivation:

Amount of #ATP# used = #"2 ATPs"#

Molecules of #NADH_2# produced = #2 NADH_2#
which means #(2xx3)# = #"6 ATPs"#

Molecules of #ATP# produced = #"4 ATPs"#

So total #ATPs# produced = #"4+ 6"# = #"10 ATPs"#

Net gain of #ATP# = #"ATP produced - ATP used"#

net gain of #ATP# = #10 - 2# = #color(red)(ul(color(black)("8 ATPs)))#

Hope it helps...