The density of the alkane by air is 4.414. Set its formula.
| November 30, 2020 | education
general alkane formula CnH2n + 2
molar mass from here 12n + 2n + 2 = 14n + 2
find the molar mass of an alkane by density
molar mass of air, constant value equal to 29
Mr (alkane) = D (air) * Mr (air) = 4.414 * 29 = 128
14n + 2 = 128
14n = 126
n = 9
substitute and get C9H20
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