Question

Lithium has a relative atomic mass of 7. Bromine has a relative atomic mass of 80. A compound was found to contain 16g of lithium and 183g of bromine. What is the empirical formula of this compound?

Answer 1

Answer:

to get the empirical formula of 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,

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,

Number of moles of Li= 2

Similarly,

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.

hope it helps ☺️