D. 18 x 10^23 is the total number of atoms in 1.0 mole of CO2
Answer: 2.4 M
Explanation:
According to the neutralization law,

where,
= molarity of
solution = 3.5 M
= volume of
solution = 34.3 ml
= molarity of
solution = ?
= volume of
solution = 50 ml
= valency of
= 1
= valency of
= 1


Therefore, the concentration of NaOH solution is 2.4 M.