< Question 20 of 38 A metal (M) forms a compound with the formula MIX. The...

Question

Question

Answer 1

Answer #1

Consider 1 mol of MI2

It has 2 moles of I
Mass of I = 2*molar mass of I
=2*126.90
= 253.8 g

Now use:
Mass % of I = mass of I * 100 / mass of MI2
79.97 = 253.8 * 100 / mass of MI2
mass of MI2 = 317.37 g

So,
Mass of M = mass of MI2 - mass of I
= 317.37 g - 253.8 g
= 63.57 g

This is also molar mass of M since 1 mol of MI2 has 1 mol of m
This is molar mass of Cu

Answer: Cu

Answer 2

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