1) molarity = (W /MW) (1000 / V in mL)
molarity = (14.0 / 142) (1000 / 250)
molarity = 0.394 M
answer = option 5 = 0.394 M
2) Ca(OH)2 + 2HCl ---------> CaCl2 + 2H2O
1 mole Ca(OH)2 reacts with 2 moles HCl
0.500 moles Ca(OH)2 reacts with 0.500 x 2 = 1.0 moles HCl
M = n /V
V = M / n = 0.250 / 1.0
V = 1.0 L
answer = option 4 = 1.0 L
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