Respuesta :
Answer: The formula mass of caffeine is 97 amu and molar mass of caffeine is 194 g/mol
Explanation:
Formula mass is defined as the sum of the mass of all the atoms each multiplied its atomic masses that are present in the empirical formula of a compound. It is expressed in amu.
Molar mass is defined as the sum of the mass of all the atoms each multiplied its atomic masses that are present in the molecular formula of a compound. It is expressed in g/mol.
Empirical formula is defined as the formula in which atoms in a compound are present in simplest whole number ratios.
The molecular formula of caffeine is [tex]C_8H_{10}N_4O_2[/tex]
Dividing each number of atoms by '2', we will get the empirical formula of caffeine. The empirical formula of caffeine is [tex]C_4H_5N_2O[/tex]
We know that:
Atomic mass of carbon = 12 amu
Atomic mass of hydrogen = 1 amu
Atomic mass of nitrogen = 14 amu
Atomic mass of oxygen = 16 amu
Formula mass of caffeine = [tex](4\times 12)+(5\times 1)+(2\times 14)+(1\times 16)]=97amu[/tex]
Molar mass of caffeine = [tex](8\times 12)+(10\times 1)+(4\times 14)+(2\times 16)]=194g/mol[/tex]
Hence, the formula mass of caffeine is 97 amu and molar mass of caffeine is 194 g/mol
