Answer: The molarity of HCl is 0.041 M.
Step-by-step explanation:
To calculate the molarity of acid, we use the equation given by neutralization reaction:

where,
are the n-factor, molarity and volume of acid which is HCl
are the n-factor, molarity and volume of base which is KOH
We are given:

Putting values in above equation, we get:

Hence, the molarity of HCl is 0.041 M.