A pure gas contains 81.71% carbon and 18.29% hydrogen by mass. Its density is 1.97 g/L

Expert Solution

element % A.Wt relative number simple ration simplest ratio

C 81.71 12 81.71/12 = 6.8 6.8/6.8 = 1 1*3 = 3

H 18.29 1 18.29/1 = 18.29 18.29/6.8 = 2.68 2.68*3 = 8

The empirical formula = C3H8

The empirical formula mass = 12*3 + 8 = 44g/mol

molecular formula = ( empirical formula)n

At STP

molar mass = volume * density

= 22.4L/mole* 1.97g/L = 44g/mole

n = molar mass/empirical formula mass

= 44/44 = 1

molecular formula = (C3H8)1 = C3H8

queen_honey_blossom answered 2 years ago

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