How many moles are present in $64 g$ of $C H_{4}$ ? (molar mass $= 16 g/mol$ )

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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…
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 $= 44 g/mol$ )