4. What is the molecular formula of a hydrocarbon containing 84.6% carbon by mass with a molar mass of 142.3 g mol −1?
(A) C20H44
(B) C11H10
(C) C10H22
(D) C5H11

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統計： A(0), B(2), C(1), D(0), E(0) #3217450

詳解 (共 1 筆)

#6051252
首先由分子量為142.3這一點即可刪除Ａ...
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