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Ways to Define Concentration

How many of t...

Question

How many of the following species is/are equal to $0.05$ moles if its weight is $3$ g ?
$C H_{3} C O O H, C H_{3} C H_{2} C H_{2} O H, N H_{2} C O N H_{2}, H N O_{3}$ ?

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Solution

The molar masses of $C H_{3} C O O H, C H_{3} C H_{2} C H_{2} O H, N H_{2} C O N H_{2}, H N O_{3}$ are
$60$ g/mol, $60$ g/mol, $60$ g/mol and $63$ g/mol respectively.
Now, $\frac{3}{60} = 0.05$ .
Hence, $3$ g of $C H_{3} C O O H, C H_{3} C H_{2} C H_{2} O H, N H_{2} C O N H_{2}$ will form $0.05$ moles.
Thus, $3$ species form $0.05$ mole from $3$ g of $C H_{3} C O O H, C H_{3} C H_{2} C H_{2} O H, N H_{2} C O N H_{2}, H N O_{3}$ .

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