Question

How many moles are there in 2 Kg of LiBr

Answer 1

To find out how many moles there are in 2 kg of lithium bromide (LiBr), you need to follow these steps:

1. **Calculate the molar mass of LiBr:**
- Lithium (Li) has an approximate atomic mass of 6.94 g/mol.
- Bromine (Br) has an approximate atomic mass of 79.9 g/mol.

Molar mass of LiBr = (6.94 g/mol) + (79.9 g/mol) = 86.84 g/mol.

2. **Convert the mass from kilograms to grams:**
\[
2 \, \text{kg} = 2000 \, \text{g}
\]

3. **Use the molar mass to find the number of moles:**
\[
\text{Number of moles} = \frac{\text{mass (g)}}{\text{molar mass (g/mol)}}
\]
\[
\text{Number of moles} = \frac{2000 \, \text{g}}{86.84 \, \text{g/mol}} \approx 23.05 \, \text{moles}
\]

So, there are approximately **23.05 moles** in 2 kg of LiBr.