Respuesta :
6.015 multiplied by 0.0742 + 7.016 multiplied by 0.9258 = 6.94
To get empirical formula of the compound, we will follow certain steps:
Step 1: Find the number of moles of lithium that is Li and bromine that is Br.
To calculate number of moles, we will follow the equation,
[tex] Number of moles of a substance= \frac{Given mass of the substance}{Molar mass of the substance} [/tex]
Here the given mass of Li=16 g
Given mass of Br=183 g
Molar mass of Li= 7 g mol⁻¹
Molar mass of Br= 80 g mol⁻¹
So,
[tex] Number of moles of Li= \frac{Given mass of the Li}{Molar mass of the Li} [/tex]
[tex] Number of moles of Li= \frac{16}{7} [/tex]
Number of moles of Li= 2
Similarly,
[tex] Number of moles of Br= \frac{Given mass of the Br}{Molar mass of the Br} [/tex]
[tex] Number of moles of Br= \frac{183}{80} [/tex]
Number of moles of Br= 2
Step 2: Find the smallest number of moles:
Smallest number of moles is 2 as both moles are same
Step 3: Find the ratio of the atom by diving their moles with smallest number of moles:
Ratio of Li= \frac{2}{2}
=1
Ratio of Br= \frac{2}{2}
=1
So the empirical formula is Li₁Br₁ that is LiBr.
