A solid mixture weighing 5 g contains equal number of moles of $\mathrm{Na}_2 \mathrm{CO}_3$ and $\mathrm{NaHCO}_3$. This solid mixture was dissolved in 1 L of water. What is the volume (in mL ) of 0.1 M HCl required to completely react with this 1 L mixture solution?

• A

  $157.8$
• Correct answer
  B

  $789.0$
• C

  $1578.0$
• D

  $946.8$

Hence, the correct answer is option: 'B'.