What volume of 75% alcohol by mass ( d = 0.8 g / c m 3 ) must be used to prepare 150 cc of 30% alcohol by mass ( d = 0.9 g / c m 3 ) ?

Question

What volume of 75% alcohol by mass ( d = 0.8 g / c m 3 ) must be used to prepare 150 cc of 30% alcohol by mass ( d = 0.9 g / c m 3 ) ?, 44.44 mL, 56.25 mL, 67.5 mL, 33.56 mL

MARKS App · Accepted Answer

M 1 V 1 = M 2 V 2 ρ = W r V 4 V r = W r ρ 75 100 × V × 0.8 = 30 100 × 150 × 0.9 V = 67.5 ml

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