V1 - ?; С1 = 2.50 mol/L, C2 = 0.500 mol/L, V2 = 0.100 L
C1 = n/V1 ; С2 = n/V2 "\\implies" C1V1 = C2V2
V1 = C2V2/C1 = 0.500*0.100/2.50 = 0.0200 L = 20.0 mL
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