Question #17866

Question

1729 views around the world

You can reuse this answer
Creative Commons License

Answer 1 · 2017-06-14T16:07:44

The mixture is 35.7 % #"Mg"^"+"# and 64.3 % #"Mg"^"2+"#.

Let #x# be the fraction of #"Mg"# that absorbs 750 kJ.

Then (1-x) is the fraction that absorbs 1450 kJ.

#750x + 1450(1-x) = 1200#

#750x + 1450 - 1450x = 1200#

#700x = 250#

#x = 250/700 = 0.357#

∴ The mixture is 35.7 % #"Mg"^"+"# and 64.3 % #"Mg"^"2+"#.