Question

naoh + hcl → nacl + h₂o
40g 36.5g? 18g
part a
what is the mass of sodium chloride (nacl) produced in this reaction?
54.5 g
58.5 g
62 g

Explanation:

Step1: Apply law of conservation of mass

According to the law of conservation of mass, the total mass of reactants equals the total mass of products in a chemical - reaction.
The mass of reactants is $m_{reactants}=40g + 36.5g=76.5g$.
The mass of one of the products (water) is $m_{H_2O}=18g$. Let the mass of sodium chloride be $m_{NaCl}$.

Step2: Calculate mass of NaCl

We know that $m_{reactants}=m_{NaCl}+m_{H_2O}$.
So, $m_{NaCl}=m_{reactants}-m_{H_2O}$.
Substitute the values: $m_{NaCl}=76.5g - 18g=58.5g$.

Answer:

58.5 g