The mass of an iron bolt was 5.4 greater when it was manufactured. After being bolted...

The mass of an iron bolt was 5.4 greater when it was manufactured. After being bolted to an outdoor structure for several months, the mass of the bolt was found to hae increased by 0.2 grams. Given the following balanced equation for the reaction, does the example support the law of conservation of mass? Why or why not?

4Fe +3O2--> 2Fe2O3

Expert Solution

4Fe +3O₂ 2Fe₂O₃

Yes,the given equation supports the conversion of mass .

When iron is exposed to atmosphere it absorbs the atmospheric oxygen and forms Fe₂O₃

Molar mass of Fe is 55.85 g/mol

Molar mass of Fe₂O₃ is (2xAt.mass of Fe) + (3xAt.mass of O )

= ( 2x55.85) + ( 3x16)

= 159.7 g/mol

Molar mass of O₂ is = 2x16 = 32 g/mol

According to the balanced equation ,

4x55.85(=223.4) g of Fe reacts with 3x32(=96) g of O₂ to produces 2x159.7(=319.4) g of Fe₂O₃

So total mass of the reactants is = 223.4 + 96 = 319.4 g

total mass of the products is = 319.4 g

So the total mass of the reactants = total mass of the products

Therefore the mass is conserved

queen_honey_blossom answered 1 year ago

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