Question

1 gram of Iron $\left(Fe\right)$ contains ______ atoms.

(Molecular Weight of $Fe=56$ g/mole)

• A. $1.075\times {10}^{25}$
• B. $1.075\times {10}^{22}$
• C. $1.075\times {10}^{26}$
• D. $1.075\times {10}^{27}$

Answer 1

The correct option is B $1.075\times {10}^{22}$

For $Fe$ atoms molar mass $56$ g/mole.

$1$ mole $={6.023\times 10}^{23}$ atoms.

$56$ g $={6.023\times 10}^{23}$atoms.

$1$ g $=\frac{{6.023\times 10}^{23}}{56}$ atoms

$=1.075\times {10}^{22}$ atoms.