Chemistry, 17.07.2019 23:30, davidoj13

Which of the following is a balanced chemical equation?

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answered: kingzae04

The correct answer is Option 4.

Explanation:

Law of conservation of mass states that mass can neither be created nor can be destroyed but it can only be transformed from one form to another form. This law also states that the total number of individual atoms on the reactant side will be equal to the total number of individual atoms on the product side.

Every balanced chemical equation follows law of conservation of mass.

For the given options:

Option 1: $BaCl_2+H_2SO_4\rightarrow BaSO_4+HCl$

Here, number of chlorine and hydrogen atoms on the reactant and product side are not same. Thus, this equation is not balanced.

Option 2: $Cl_2+NaBr\rightarrow NaCl+Br_2$

Here, number of chlorine and bromine atoms on the reactant and product side are not same. Thus, this equation is not balanced.

Option 3: $2H_2+N_2\rightarrow 2NH_3$

Here, number of hydrogen atoms on the reactant and product side are not same. Thus, this equation is not balanced.

Option 4: $2H_2+O_2\rightarrow 2H_2O$

Here, number of hydrogen and oxygen atoms on both the sides are same. Thus, it is a balanced equation.

Hence, the correct answer is Option 4.

answered: Guest

answer: the enthalpy of the overall chemical reaction is +87.88 kj or +88 kj.

according to hess's law, the overall enthalpy of a reaction is the difference between the sum of enthalpy values of all the products and the sum of enthalpy values of all the reactants.

δh(reaction) = ∑nδh(products) - ∑nδh(reactants)

δh(reaction) = [δh $pcl_{3}$ +δh $cl_{2}$ ] - [δh $pcl_{5}$ ]

δh(reaction) = [1(-287.02) + 1(0) ] - [1(-374.9)] kj = +87.88 kj

here, δh (pcl3) = -287.02 kj, δh(cl2) = 0, δh(pcl5) = -374.9 kj

therefore, enthalpy of the overall reaction is +87.88 kj or +88 kj.

answered: Guest

in 1783 cavendish was working with his hydrogen gas and found that when he burned it and condensed the vapor it was water. this was very significant since it disproved the greek theory of elements completely since water was not a simple substance but the product of two gases. it was lavoisier who hearing of the experiment gave cavendish's gas the name hydrogen ("water-producer") and added that hydrogen burned by combining with oxygen and that water was a hydrogen-oxygen combination.

explanation: