The answer is C, because if the copper has a +2 charge, the fluoride must have a -2 charge in order to cancel out.
I think it's E. heating of water
Because exothermic process discharges heat, causing the temperature of the prompt environment to rise
Please correct me if I'm wrong!! I'd be happy to fix it!! :)
= 2 × 23 + 2 × 52 + 2 × 16
= 182 grams
1 mole of 
weighs = 182 g
8 moles weigh = 8× 182
=
or
I think it’s 1 mole
If Iam not mistaken
Yes it is polluting the river with everything the manufaturing plant gives off such as the chemicals released in the air
