Question

calculate the number of molecules, number of atoms and number of electrons in 1.6 grams of methane.

Answer 1

$$\begin{gathered} Mole=\frac{Givenmassing}{molarmass} \\ =\frac{1.6}{16}=0.1mole \\ 1.Noofmolecules \\ =mole\times N_A \\ =0.1\times 6.023\times {10}^{23}=6.023\times {10}^{22} \\ 2.Noofatoms \\ =mole\times N_A\times Numberofatomsinthemethanemolecule(C{H}_4-5atoms) \\ =0.1\times 6.023\times {10}^{23}\times 5=30.11\times {10}^{22} \\ 3.Noofelectrons \\ =mole\times N_A\times Numberofelectronsinthemethanemolecule(C{H}_4-6+(4\times 1)=10) \\ =0.1\times 6.023\times {10}^{23}\times 10=6.023\times {10}^{23} \end{gathered}$$