Question

由乙炔和乙醛組成的混和氣體，經(jīng)測定其中碳的質(zhì)量分?jǐn)?shù)是72％，則混和氣體中氧的質(zhì)量分?jǐn)?shù)是

1. A.
   32.33％
2. B.
   22.65%
3. C.
   19.56%
4. D.
   2.14%

Answer 1

C
乙炔為C₂H₂，乙醛為C₂H₄O---C₂H₂(H₂O)，CH中碳?xì)浔葹?2:1，碳的質(zhì)量分?jǐn)?shù)是72％，氫的質(zhì)量分?jǐn)?shù)為6﹪，H₂O中總含量為22﹪，氧的質(zhì)量分?jǐn)?shù)為22﹪×16／18=19.56﹪。