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determine the emparical formula of an acidic of iron which has 69.9% iron and 30.1% by mass (at mass fe= 55.05, 0= 16 amu

Posted by Kajal Verma 3 years, 11 months ago

CBSE > Class 11 > Chemistry

5 answers

Dεερακ Ȿιηɠꜧ 3 years, 11 months ago

The iron oxide has $$69.9%$$ iron and $$30.1%$$ dioxygen by mass.
Thus, $$100 g$$ of iron oxide contains $$69.9 g$$ iron and $$30.1 g$$ dioxygen.
The number of moles of iron present in $$100 g$$ of iron oxide are $$\frac{69.9}{55.8}=1.25$$.
The number of moles of dioxygen present in 100 g of iron oxide are $$\frac{30.1}{32}=0.94$$.
The ratio of the number of oxygen atoms to the number of carbon atoms present in one formula unit of iron oxide is $$\frac{2×0.94}{1.25}=1.5:1=3:2$$.
Hence, the formula of the iron oxide is $$Fe2O3$$<hr> $$\mathbb{YOUR\ ANSWER \ IS \ COMPLETED} $$

Kajal Verma 3 years, 11 months ago

There is O2 is mass

Kajal Verma 3 years, 11 months ago

Sry for that

Kajal Verma 3 years, 11 months ago

Don't know about mass of compound

Dεερακ Ȿιηɠꜧ 3 years, 11 months ago

What is mass of compaund ?? Without mass of compaund it's impossible to determine any formula . . ..

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