Chemical Make up of One of Chloroform
Element Number of Moles Mass per Mole (grams)
Carbon 1 12.011
Hydrogen 1 1.008
Chlorine 3 35.453
A chemical solvent is a substance that dissolves another to form a solution. For example, water is a solvent for sugar. Unfortunately, many chemical solvents are hazardous to the environment. One eco-friendly chemical solvent is chloroform, also known as trichloromethane ( $C H {C l}_{3}$ ). The table above shows the chemical makeup of one mole of chloroform.
If a chemist starts with $1, 000$ grams of chloroform and uses $522.5$ grams, how many moles of chlorine are left?

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Solution

$C H C l_{3} \to C + H + 3 C l$
Chloroform used= $522.5 g m$
Now, number of moles $= \frac{w e i g h t}{m o l e c u l a r w e i g h t}$
Molecular weight of Chloroform ( $C H C l_{3}$ ) $= 119.5 g / m o l$
Moles of $C H C l_{3}$ used= $4.376$
Moles of Chlorine formed = $4.376 m o l e s$
Now considering chlorine left= $1000 - 522.5 = 477.5$
Moles of $C H C l_{3} = 3.999 \approx 4$
Hence, moles of Chlorine left= $4$

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