Question

A sample of glucose, C6H12O6, contains 6.02 × 1022 atoms of carbon. How many moles of hydrogen atoms and how many moles of glucose does it contain.

Answer 1

Glucose  has    6  number  of  carbon  atoms,  12  atoms  of  oxygen  and   6  atoms  of  oxygen
The  total  number  of  glucose  atom is  24  atoms
The  atom  of  hydrogen is twice  that  of   carbon  
that  is (6.02 x10^22) x2=1.204 x10^23atoms
the  number  of  moles  of  hydrogen  is   solved  as   follows
1mole  =  6.02x10^23 atoms  what   about  1.204 x10^23=
{(1.204x10^23)/(6.02 x10^23)}=0.2moles
The  moles  of  glucose
1   atom  of   glucose=  6.02 x10^22  x4 =2.408 x10^23  atoms
moles= { (2.48 x10^23)/(6.02  x10^23)}=0.41moles

Answer 2

Because of the chemical formula of glucose we can infer the rations of each atom from one another, we can see that every 6 atoms of carbon there are 12 atoms of hydrogen. Therefore, there is twice as much hydrogen than carbon or 12.04 × 10^22 atoms or 0.2 moles of hydrogen in the sample. Following this we can infer that a glucose molecule needs 6 atoms of carbon, therefore we divide the amount of carbon by 6, and converting it into moles we will get 0.0167 moles of glucose.