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Melting Point of Alkanes

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Question

The compound in which mass percentage of carbon is 75%and that of hydrogen is 25%is

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Solution

Amount of carbon in 100 grams of compound is = 75 grams
Amount of hydrogen present in 100 grams of compounds = 25 grams
Number of moles of carbon =
$\frac{W e i g h t o f c a r b o n}{M o l e c u l a r w e i g h t o f c a r b o n} = \frac{75}{12} = 6.25$
$N u m b e r o f m o l e s o f h y d r o g e n = \frac{W e i g h t o f h y d r o g e n}{M o l e c u l a r w e i g h t o f h y d r o g e n} = \frac{25}{1} = 25 m o l e s$
$H e n c e r a t i o o f n u m b e r o f m o l e s o f c a r b o n a n d h y d r o g e n i s$
$n_{C} : n_{h} = 6.25 : 25$
$n_{C a r b o n} : n_{h y d r o g e n} = 1 : 4$
$H e n c e t h e c o m p o u n d i s {C H}_{4}$

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