QUESTION 15 The fact that a quasar can vary in brightness over short time scales implies that these objects must by very: a. distant b. luminous c. small d. massive e. large

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kenzieeee96

01.05.2020

Physics

The correct answer is $Fe_2O_3+6HCl\rightarrow 2FeCl_3+3H_2O$

Explanation: A balanced equation follows law of conservation of mass.

This law states that the total mass on the reactants will be equal to the total mass on the products.

For the reaction of rust with hydrochloric acid, the balanced chemical equation is:

$Fe_2O_3+6HCl\rightarrow 2FeCl_3+3H_2O$

Total mass on the reactant side: $[(2\times 56)+(3\times 18)]+6[1+35.5]=379g/mol$

Total mass on the product side: $2[56+(3\times 35.5)]+3[(2\times 1)+16]=379g/mol$

As, total mass of reactant is equal to the total mass of the products. Hence, this equation is balanced chemical equation.

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