Question

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

Answer 1

When you work with molar mass, you solve for the quantity of ''Moles'' within the substance by converting Mass. The way you can tell the equation is balanced would be by knowing whether the moles were equivalent on both sides or not. Therefore, if they are equal, it is balanced considering you have the same amount of moles on each side of the equation.

Answer 2

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 : $2Na+2H_2O\rightarrow 2NaOH+H_2$

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

$2Na+2H_2O=2NaOH+H_2$

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

$2(23)+2(2\times 1+16)=2(23+16+1)+2(1)$

$82=82$

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