1.50 g oxide of M,MO2 reacts with excess hydrochloric acid solution ,HCL to produce 386 cm^3 chlorine gas at STP

Question

MO2 + HCL --> MCL + H2O + CL2
Questions
1) balance the equation
2)Determine relative molecular mass of MO2 and relative atomic mass of M

Answer 1

I think you have made a typo. Could that be
MO2 + HCL --> MCL2 + H2O + CL2