Answer : 5100 KJ
Explanation : In the given reaction of

we can see that 2 moles of Al is producing -850 KJ of energy
so for 12 moles of Al we can calculate as;
12 moles of Al X

= -
5100 KJ
So, we can say that 12 moles of Al will need -5100 KJ of energy.
The simplest ion that copper forms in solution is the typical blue hexaaquacopper(II) ion - [Cu(H2O)6]<span>2+</span>
Answer : The volume of the resulting solution will be 0.4999 L.
Explanation : As the two molar concentration of the

solution are given and one of the volume concentration needs to be found.
So, according to the formula :-

And here if we consider

as 0.1718 L moles and

as 0.3556 moles then we need to find

as

is given as 0.1222 moles.
Hence on solving the formula we get,

= (0.1718 X 0.3556) / 0.1222 = 0.4999 L
Hello,
I think the answer is B) It is second longest river in south america
Hope this helps!!
~Girlygir101~
Answer:
D. it's a displacement reaction