Answer:
1.06 M
Explanation:
Lets answer this question using the definition for molarity of a solution, M.
M = mol of solute/ Volume of solution in L
We are adding more moles of NaOH to a solution which is already 2.40, so the final number of moles are
25 g x 1 mol / 40 g/mol = 0.625 mol
mol NaOH in 1.5 L of 2.40 M NaOH:
1.5 L x 2.40 mol/L = 3.6 mol
Total # mol = 0.625 mol + 3.6 mol = 4.23 mol
The final volume is 4.00 L so the new molarity is:
M = 4.23 mol / 4 L = 1.06 M
Im guessing here but i think it's true
Atomic mass of sodium is 22.9 g/mol
atomic mass of chloride is 35.45 g/mol
sodium chloride is 22.99 + 35.45= 58.44 g/mol
F=m*a. his second law i think