Alkanes share a general chemical formula of C_n H₂_n+2 .What is n of an alkane with a molar mass in the range of 140-145 g/mol?

Question

Quizplus · Accepted Answer

The general formula for alkanes is CnH2n+2. Given the molar mass range of 140-145 g/mol, we can calculate the number of carbon atoms (n) by considering the molar mass of carbon (12 g/mol) and hydrogen (1 g/mol). For an alkane, the molar mass can be approximated as 12n + (2n+2) = 14n + 2. Setting this equal to the average value in the given range (142.5 g/mol) and solving for n gives a value close to 10, making option A correct.

Alkanes Share a General Chemical Formula of Cn H2n+2

Alkanes Share a General Chemical Formula of C_n H₂_n+2