Question

calculate the number of moles, number of molecules and number of atoms in 38g of fluorine gas.

Answer 1

Answer on Question #44978 – Chemistry – Inorganic Chemistry

Question

Calculate the number of moles, number of molecules and number of atoms in $38\mathrm{g}$ of fluorine gas.

Solution

Formula of fluorine molecule is $\mathbf{F}_2$

Molar mass of $\mathsf{F}_2$: $M = 38.0\mathrm{g / mol}$

Given that mass of $\mathsf{F}_2$: $m = 38\mathrm{g}$

Number of moles $(n)$:

$$n = \frac {m}{M} = \frac {38\ g}{38.0\ g/mol} = 1\ mol$$

Number of molecules $(N)$:

$$N = n \cdot N _ {A} = 1\ mol \cdot 6.023 \cdot 10^{23}\ \frac{\text{molecules}}{\text{mol}} = 6.023 \cdot 10^{23}\ \text{molecules}$$

Since each molecule of fluorine consists of two atoms, the number of atoms in given amount of fluorine gas is two times greater than the number of molecules, i.e. $1.205 \cdot 10^{23}$ atoms.

Answer:

1 mole,

6.023·10²³ molecules

1.205·10²³ atoms

http://www.AssignmentExpert.com/