等质量的乙炔和醋酸的摩尔比是30:13。计算过程为:乙炔的分子式为C2H2,结构简式为HC≡CH,摩尔质量为26g/mol。乙酸的分子式为C2H4O2,结构简式CH3COOH,摩尔质量为60g/mol。因物质的量=质量/摩尔质量有n(C2H2):n(CH3COOH)=[m(C2H2)/M(C2H2)]:[m(CH3COOH)/M(CH3COOH)]=M(CH3COOH):M(C2H2)=60:26=30:13