Question

How many mol of carbon in 2.0 mol of caffeine?

Answer 1

Moles caffeine = 2.0 g / 194.19 g/mol=0.010 

in one mole of caffeine there are 8 moles of C 

Answer 2

Answer : The number of moles of carbon in 2.0 mole of caffeine are, 16 moles

Solution :

The formula of caffeine is, $C_8H_{10}N_4O_2$

As we know that, 1 mole of caffeine contains 8 moles of carbon atom, 10 moles of hydrogen atoms, 4 moles of nitrogen atoms and 2 moles of oxygen atoms.

According to the question,

As, 1 mole of caffeine contains 8 moles of carbon atoms

So, 2 moles of caffeine contains $8\times 2=16$ moles of carbon atoms

Therefore, the number of moles of carbon in 2.0 mole of caffeine are, 16 moles