The following equation shows the dissociation of barium hydroxide in aqueous solution: Ba(OH)2 --> Ba2+ + 2OH- Determine the number of moles of hydroxide ion in 250.00 ml of a 0.20 M solution of barium hydroxide.​

it would be d. henry moseley

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the correct answer would be d. hope this !

so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer