Respuesta :
The periodic table is the arrangement of the elements based on their atomic numbers. The theoretical yield of lithium bromide will be 151 gm.
What is a theoretical yield?
A theoretical yield is the estimation of the number of moles of product formed in relation to the reactants consumed in a reaction.
The balanced chemical reaction can be shown as:
[tex]\rm LiOH + HBr \rightarrow LiBr + H_{2}O[/tex]
From the reaction, it can be seen that the moles of all the compounds and molecules are 1.
The molar mass of lithium hydroxide is calculated as:
6.94 + 15.999 + 1.008 = 23.947 gram per mol
The molar mass of hydrogen bromide is calculated as:
1.008 + 79.904 = 80.912 gram per mol
The moles of lithium hydroxide is calculated as:
[tex]117\;\rm g (\dfrac{1\;\rm mol}{23.947}) = 4.89\;\rm mol[/tex]
The moles of hydrogen bromide is calculated as:
[tex]141\;\rm g (\dfrac{1\;\rm mol}{80.91}) = 1.74\;\rm mol[/tex]
From this, it can be said that hydrogen bromide is a limiting reagent as it has fewer moles than LiOH.
The molar mass of lithium bromide is given as, 6.94 + 79.904 = 86.844 grams per mol
Mass of lithium bromide formed will be:
[tex]\rm 1.74\;\rm mol (\dfrac{86.84}{1\;\rm mol}) = 151\;\rm gm[/tex]
Therefore, the theoretical yield of lithium bromide is option C. 151 gm.
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