Based on the molar masses, how can you tell that an equation is balanced?

Explanation :

According to the law of conservation of mass, the mass of reactant must be equal to the mass of product. That means mass remains conserved.

Based on the molar masses, we can tell that an equation is balanced or not.

If the sum of the molar mass of reactant side will be equal to the sum of the molar mass of product side then we can tell that an equation is balanced otherwise an equation is not balanced.

For example :

Now we have to check that this reaction is balanced or not.

As per law of conservation of mass,

Sum of molar mass of reactant = Sum of molar mass of product

The molar mass of sodium(Na), hydrogen(H) and oxygen(O) are 23, 1 and 16 g/mole respectively.

The mass of reactant side is equal to the product side that means this equation is balanced.

um i think it might be a car?

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.