Question

What will be the correct no. of total electrons in $1.6g$ methane

• A. $6.02\times 10^{24}$
• B. $6.02\times 10^{23}$
• C. $6.02\times 10^{22}$
• D. $9.632\times 10^{23}$

Answer 1

Answer: (B)

Given, mass $=1.6g$ of methane

Therefore, moles of methane $=\frac{\text{ given mass }}{\text{ molecular mass }}$

$=\frac{1.6g}{16gmo{l}^{-1}}=0.1mol$

1 mole of methane has $6.022\times 10^{23}$ molecules.

$\therefore 0.1$ mole of methane has

$6.022\times 10^{23}\times 0.1\text{ molecules }$

$=6.022\times 10^{22}\text{ molecules }$

Now, 1 mole of methane has 10 electrons

$\therefore 0.1$ mole of methane has

$=10\times 6.022\times 10^{22}$ electrons

$=6.022\times 10^{23}$ electrons