Question

A binary compound of Iron and Oxygen contains 21g iron (at mass 56u) for every 8g of oxygen . What is the empirical formula of the compound ?​

Answer 1

Answer:

Compute the percent composition of a compound

Determine the empirical formula of a compound

Determine the molecular formula of a compound

Answer 2

Answer:

Percentage of iron by mass =69.9%

Molar mass of iron =55.85

Percentage of oxygen by mass =30.1%

Molar mass of oxygen =16

Now,

Relative mass of iron in iron oxide =  

At. mass of iron

Percentage of iron by mass

​  

=  

55.85

69.9

​  

=1.25

Relative mass of oxygen in iron oxide =  

At. mass of oxygen

Percentage of oxygen by mass =  16

30.1

​  

=1.88

Now,

Simplest molar ratio of iron to oxygen =1.25:1.88=2:3

Hence the empirical formula of iron oxide is Fe  2 O3

​  

.

Explanation:

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