Question

Be sure to answer all parts. Caffeine occurs naturally in coffee and tea, and is present in many soft drinks. The formula of caffeine is C,H1N402. Calculate the formula mass and molar mass of caffeine. Formula mass = amu Molar mass = g/mol

Answer 1

Answer: The formula mass of caffeine is 97 amu and molar mass of caffeine is 194 g/mol

Step-by-step 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
`C_8H_(10)N_4O_2`

Dividing each number of atoms by '2', we will get the empirical formula of caffeine. The empirical formula of caffeine is
`C_4H_5N_2O`

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 =
`(4* 12)+(5* 1)+(2* 14)+(1* 16)]=97amu`

Molar mass of caffeine =
`(8* 12)+(10* 1)+(4* 14)+(2* 16)]=194g/mol`

Hence, the formula mass of caffeine is 97 amu and molar mass of caffeine is 194 g/mol