Question

calculate molecules present in 46 gram of sodium

Answer 1

$\textbf{Answer is as follows} : \\ \\ \textbf{ Given, Mass of sodium = 46 gram} \\ \\ \textbf{To find , number of molecules of sodium present in the given mass} \\ \\\textbf{ Firstly , we will calculate number of moles of Sodium ( Na ) present in 46 gm} \\ \\ \textbf{ No. of moles = Given Mass ÷ molar mass} \\ \\ \textbf{ We know, molar mass of sodium = 23 gram} \\ \\ \textbf{ Substituting the values , we get :-} \\ \\ \textbf{ No. of moles = 46 gram divided by 23 gram = 2 moles} \\ \\ \textbf{ So, No. of moles present in the given mass is 2 mole} \\ \\ \textbf{We know} , \\ \\ \textbf{No. of molecules = No. of moles into Avogadro Number} \\ \\ \textbf{ Substituting the values , we get} \\ \\ \textbf{No. of molecules = 2 into 6.022 into 10^{23}} \\ \\ \textbf{ No. of molecules = 12.044 \: multiplied \: by \: 10}^{23}\textbf{( Answer )}$