2) The stimulant in coffee and tea is caffeine, a substance of molar mass 194 g/mol. When 0.376g of caffeine was burned, 0.682 g of carbon dioxide, 0.174 g of water, and 0.110 g of nitrogengas were formed. If caffeine is made of carbon, hydrogen, nitrogen, and oxygen, determine theempirical and molecular formulas of caffeine, and write the balanced equation for thecombustion of caffeine.Balanced Combustion Equation

The molar mass of caffeine, CO2, H2O, and N2 is 194 g/mol, 44 g/mol, 18 g/mol, and 28 g/mol…

Answered: 2) The stimulant in coffee and tea is…

Chemistry & Chemical Reactivity

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2) The stimulant in coffee and tea is caffeine, a substance of molar mass 194 g/mol. When 0.376
g of caffeine was burned, 0.682 g of carbon dioxide, 0.174 g of water, and 0.110 g of nitrogen
gas were formed. If caffeine is made of carbon, hydrogen, nitrogen, and oxygen, determine the
empirical and molecular formulas of caffeine, and write the balanced equation for the
combustion of caffeine.
Balanced Combustion Equation

Expert Solution

Step 1

The molar mass of caffeine, CO₂, H₂O, and N₂ is 194 g/mol, 44 g/mol, 18 g/mol, and 28 g/mol respectively.

The number of mole of each is calculated as follows:

$n_{caffeine} = \frac{0.376 g}{194 g / mol} = 0.002 mol n_{{CO}_{2}} = \frac{0.682 g}{44 g / mol} = 0.0155 mol n_{H_{2} O} = \frac{0.174 g}{18 g / mol} = 0.01 mol n_{N_{2}} = \frac{0.110 g}{28 g / mol} = 0.004 mol$

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