Passage II
Hydrocarbons contain carbon (C) and hydrogen (H) atoms joined by chemical bonds (which are represented in chemical notation by short straight lines). The carbon atoms are bonded to each other to form linear, branched, or cyclic structures (examples are presented in Table 1). The boiling points of these hydrocarbons were measured and listed in Table 2, and their densities (ratio of mass to volume) are listed in Table 3.
8. According to Tables 1 and 3, which hydrocarbon has the lowest density?
Your Answer is
Correct Answer is G
Explanation
Look at table 3 first, the lowest density is 0.55 g/cm3, corresponding to branched, 4 C atoms;
Back to table 1, 4 The C atom should be butane, so it is branched butane