Find the mass of barium metal (in grams) that must react with O2 to produce enough barium oxide to prepare 1.1 L of a 0.10 M solution of OH^ -.

Answer 1

moles OH^- = 1.1L x 0.1M = ??
moles Ba(OH)2 = 1/2 that.

Convert moles Ba(OH)2 to moles Ba (using the coefficients in the balanced equation)/

Convert moles Ba to grams Ba. g = moles x molar mass.