0.0505 mol·L⁻¹ is the molarity of the solution
You are diluting the solution with water, so you can use the dilution formula
с₁∨₁=с₂∨₂
You can solve this equation to get
с₂=с₁×∨₁/∨₂
с₁=0.157 mol·L⁻¹,∨₁=95.00 mL
с₂=?, ∨₂=95.00 mL + 200.0 mL = 295.0 mL
с₂= 0.157 mol·L⁻¹ × 95.00 mL/ 295 mL = 0.0505 mol·L⁻¹
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