This formula equation is unbalanced.
bacl2(aq) + na2co3(aq) mc017-1.jpg baco3(s) + nacl(aq)
which coefficient should be placed in front of nacl to balance this equation?

Answer : The coefficient placed in front of NaCl to balance this equation should be, 2

Explanation :

Balanced chemical reaction : It is defined as the reaction in which the number of different atoms of elements present in reactant side must be equal to the number of different atoms of elements present in product side.

The given unbalanced chemical reaction is,

The given balanced chemical reaction will be,

By the stoichiometry we can say that, 1 mole barium chloride react with 1 mole of sodium carbonate to give 1 mole of barium carbonate and 2 moles of sodium chloride.

Hence, the coefficient placed in front of NaCl to balance this equation should be, 2

substituting a hydrogen atom with a halogen in a hydrocarbon:

- the single bond remains single. a is wrong.

- the bond with hydrogen is as strong as with a halogen. c is wrong

- a hydrocarbon is saturated if there is no double bond. we do not know that so d is wrong.

- carbon will always have four valence electrons. e is wrong.

by elimination, the correct answer is b. the boiling point of the new compound increases.