Question #8a259

1 Answer
Manish Bhardwaj
Sep 28, 2014

The empirical formula is C#H_2# .The substance has empirical formula mass: One mole of C has mass 12 g #mol^-1# and 2 moles of H has mass 2x 1 g #mol^-1# = 2 g #mol^-1#

Empirical formula mass is 12 g #mol^-1# + 2 g #mol^-1# = 14 g #mol^-1#

Molecular formula mass is given as 42 g #mol^-1# .
Calculating n = Molecular formula mass / Empirical formula mass

n = 42 g #mol^-1#/ 14 g # mol^-1#

n = 3

Molecular formula is ( C#H_2#) 3

which is #C_3# #H_6#

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