What is empirical formula of the following-
Caffeine $(C_{8} H_{10} N_{4} O_{2})$ a substance found in tea and coffee.

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Solution

Simple integer ratio of 8 : 10 : 4 : 2 will be 4 : 5 : 2 : 1.
Thus, empirical formula of Caffeine $C_{8} H_{10} N_{4} O_{2}$ will be $C_{4} H_{5} N_{2} O$ .

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Q. An average cup of coffee contains about

125

mg caffeine,

C_{8} H_{10} N_{4} O_{2}

6.44 \times 10^{- x}

moles of caffeine are in a cup. Then, the value of

x

is:

Arabic coffee, or “Qahwah” is a very important drink in the Gulf region and in the Middle East generally. It refers to a version of brewed coffee beans that contains spices like cardamom and saffron. Qahwah is usually consumed without sugar. Finjan is a small delicate cup (typically of 25 mL volume) that is traditionally used to serve this Arabic coffee. During celebrations and gatherings, half-filled Finjans of Arabic coffee are served several times to guests. An average Finjan contains about 4.10 mg of caffeine, C8H10N4O2. How many molecules of caffeine are there in a half-filled Finjan?