Final answer:
The mass of sodium chloride formed during the reaction is 0.35 g.
Step-by-step explanation:
To calculate the mass of sodium chloride formed during the reaction, we first find the formula mass of NaCl by adding the atomic masses of sodium (Na) and chlorine (Cl) obtained from the periodic table:
Na: 22.99 amu, Cl: 35.34 amu.
Therefore, the formula mass of NaCl is 58.44 amu.
To find the mass of NaCl, we can use a conversion factor.
We know that 100 g of the solution contains 5.00 g of NaCl.
Using this, we can set up a proportion and solve for the unknown mass:
5.00 g NaCl / 100 g NaCl solution = x g NaCl / 7.00 g NaCl solution
Solving for x, we find that the mass of NaCl formed is 0.35 g.