How many hydrogen atoms are in one mole of caffeine
1 answer:
- 10
Although caffeine (a stimulant found in coffee and tea) is a relatively complicated molecule, it's only eight atoms of carbon, ten of hydrogen, four of nitrogen and two of oxygen – C8H10N4O2. This kind of representation is called a molecular formula – it tells us what kind of atoms we have, and how many of each.
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Answer : The the concentration of in mass percent is, 41.18 %
Solution : Given,
Molar mass of water = 18 g/mole
Molar mass of = 110.98 g/mole
First we have to calculate the mole fraction of solute.
According to the relative lowering of vapor pressure, the vapor pressure of a component at a given temperature is equal to the mole fraction of that component of the solution multiplied by the vapor pressure of that component in the pure state.
where,
= vapor pressure of the pure component (water) = 92.6 mmHg
= vapor pressure of the solution = 83.1 mmHg
= mole fraction of solute,
Now put all the given values in this formula, we get the mole fraction of solute.
Now we have to calculate the mole fraction of solvent (water).
As we know that,
The number of moles of solute and solvent will be, 0.102 and 0.898 moles respectively.
Now we have to calculate the mass of solute, and solvent,
.
Mass of solution = Mass of solute + Mass of solvent
Mass of solution = 11.32 + 16.164 = 27.484 g
Now we have to calculate the mass percent of
Therefore, the the concentration of in mass percent is, 41.18 %