Answered

How many moles of sulfuric acid [tex]\left( H_2SO_4 \right)[/tex] are needed to react completely with 6.8 moles of lithium hydroxide (LiOH)?

[tex]\[2 \text{LiOH} + H_2SO_4 \rightarrow \text{Li}_2\text{SO}_4 + 2 \text{H}_2\text{O}\][/tex]

A. 3.4 mol [tex]H_2SO_4[/tex]

B. 6.8 mol [tex]H_2SO_4[/tex]

C. 10.2 mol [tex]H_2SO_4[/tex]

D. 13.6 mol [tex]H_2SO_4[/tex]



Answer :

To solve this problem, we need to use stoichiometry based on the given balanced chemical equation:

[tex]\[ 2 \text{LiOH} + \text{H}_2\text{SO}_4 \rightarrow \text{Li}_2\text{SO}_4 + 2 \text{H}_2\text{O} \][/tex]

From the balanced equation, we see that 2 moles of lithium hydroxide (LiOH) react with 1 mole of sulfuric acid (H_2SO_4).

Let's break this down step-by-step:

1. Identify the mole ratio from the chemical equation:
According to the equation, 2 moles of LiOH react with 1 mole of H_2SO_4. This gives us a stoichiometric ratio of:
[tex]\[ \frac{\text{moles of LiOH}}{\text{moles of H}_2\text{SO}_4} = \frac{2}{1} \][/tex]

2. Determine the moles of sulfuric acid needed:
Here, we are given that we have 6.8 moles of LiOH. Using the mole ratio from the equation, we can find the moles of H_2SO_4 needed to react completely with 6.8 moles of LiOH.

[tex]\[ \text{Moles of H}_2\text{SO}_4 = \frac{\text{Moles of LiOH}}{2} = \frac{6.8}{2} \][/tex]

3. Calculate the moles of sulfuric acid needed:
[tex]\[ \text{Moles of H}_2\text{SO}_4 = 3.4 \][/tex]

Therefore, 3.4 moles of sulfuric acid ([tex]\( \text{H}_2\text{SO}_4 \)[/tex]) are required to react completely with 6.8 moles of lithium hydroxide ([tex]\( \text{LiOH} \)[/tex]).

Thus, the correct answer is:
[tex]\[ \boxed{3.4 \text{ mol H}_2\text{SO}_4} \][/tex]