Polyglycolic acid (repeat unit $- [O - CH X_{2} - CO] X^{-}$ , 58 g/mol) is made from hydroxyethanoic acid (76 g/mol). Ignoring end groups, the mass of hydroxyethanoic acid needed to make 29 g of PGA at 80 percent yield is

A95.0 g
B36.25 g
C38.0 g
D47.5 g

Answer: D

29 g of PGA is 29/58 = 0.50 mol of repeat units, needing 0.50 mol of acid = 38.0 g at 100 percent yield. At 80 percent yield the mass is 38.0/0.80 = 47.5 g.

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Polyglycolic acid (repeat unit −[O−CHX2​−CO]X−, 58 g/mol) is made from hydroxyethanoic acid (76 g/mol). Ignoring end groups, the mass of hydroxyethanoic acid needed to make 29 g of PGA at 80 percent yield is

Answer: D

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Polyglycolic acid (repeat unit $- [O - CH X_{2} - CO] X^{-}$ , 58 g/mol) is made from hydroxyethanoic acid (76 g/mol). Ignoring end groups, the mass of hydroxyethanoic acid needed to make 29 g of PGA at 80 percent yield is