WBJEE · Chemistry

Mole concept

21 practice questions, each with the answer and an explanation.

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Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.

All 21 questions

How many moles are present in $36 g$ of $H_{2} O$ ? (molar mass $= 18 g/mol$ )
$10 mL$ of a gaseous hydrocarbon is burnt with $70 mL$ of oxygen (an excess). After the gases are cooled to room temperature the volume is $60 mL$ , and after passing through KO…
How many moles are present in $117 g$ of $NaCl$ ? (molar mass $= 58.5 g/mol$ )
How many moles are present in $234 g$ of $NaCl$ ? (molar mass $= 58.5 g/mol$ )
How many moles are present in $72 g$ of $H_{2} O$ ? (molar mass $= 18 g/mol$ )
How many moles are present in $88 g$ of $C O_{2}$ ? (molar mass $= 44 g/mol$ )
How many moles are present in $176 g$ of $C O_{2}$ ? (molar mass $= 44 g/mol$ )
How many moles are present in $80 g$ of $NaOH$ ? (molar mass $= 40 g/mol$ )
How many moles are present in $160 g$ of $NaOH$ ? (molar mass $= 40 g/mol$ )
How many moles are present in $196 g$ of $H_{2} S O_{4}$ ? (molar mass $= 98 g/mol$ )
How many moles are present in $392 g$ of $H_{2} S O_{4}$ ? (molar mass $= 98 g/mol$ )
How many moles are present in $200 g$ of $CaC O_{3}$ ? (molar mass $= 100 g/mol$ )
How many moles are present in $400 g$ of $CaC O_{3}$ ? (molar mass $= 100 g/mol$ )
How many moles are present in $73 g$ of $HCl$ ? (molar mass $= 36.5 g/mol$ )
How many moles are present in $146 g$ of $HCl$ ? (molar mass $= 36.5 g/mol$ )
How many moles are present in $32 g$ of $C H_{4}$ ? (molar mass $= 16 g/mol$ )
How many moles are present in $64 g$ of $C H_{4}$ ? (molar mass $= 16 g/mol$ )
How many moles are present in $34 g$ of $N H_{3}$ ? (molar mass $= 17 g/mol$ )
How many moles are present in $68 g$ of $N H_{3}$ ? (molar mass $= 17 g/mol$ )
How many moles are present in $64 g$ of $O_{2}$ ? (molar mass $= 32 g/mol$ )
How many moles are present in $128 g$ of $O_{2}$ ? (molar mass $= 32 g/mol$ )

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Mole concept

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