How many grams of lithium will combine with 29.1 g of sulfur to form the compound Li2S?
Just follow the steps.
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To determine the number of grams of lithium that will combine with 29.1 g of sulfur, we need to use the molar ratios between lithium and sulfur.
Step 1: Find the molar mass of sulfur (S)
The molar mass of sulfur is approximately 32.06 g/mol.
Step 2: Find the molar mass of lithium (Li)
The molar mass of lithium is approximately 6.94 g/mol.
Step 3: Find the molar mass of Li2S (lithium sulfide)
The molar mass of Li2S can be calculated by adding the molar masses of lithium and sulfur:
Molar mass of Li2S = (2 x molar mass of Li) + (1 x molar mass of S) = (2 x 6.94 g/mol) + (1 x 32.06 g/mol) ≈ 45.94 g/mol
Step 4: Calculate the molar ratio
The molar ratio between lithium and lithium sulfide (Li2S) is 2:1 (from the formula Li2S).
Step 5: Calculate the number of moles of sulfur
To find the number of moles of sulfur, we divide the given mass (29.1 g) by the molar mass of sulfur:
Number of moles of sulfur = 29.1 g / 32.06 g/mol ≈ 0.907 mol
Step 6: Calculate the number of moles of lithium needed
Using the molar ratio between lithium and lithium sulfide (2:1), the number of moles of lithium needed is twice the number of moles of sulfur:
Number of moles of lithium = 2 (number of moles of sulfur) = 2 x 0.907 mol ≈ 1.814 mol
Step 7: Calculate the mass of lithium
To find the mass of lithium, we multiply the number of moles of lithium by the molar mass of lithium:
Mass of lithium = number of moles of lithium x molar mass of lithium = 1.814 mol x 6.94 g/mol ≈ 12.60 g
Therefore, approximately 12.60 grams of lithium will combine with 29.1 g of sulfur to form the compound Li2S.
To determine how many grams of lithium will combine with 29.1 grams of sulfur to form the compound Li2S, we need to calculate the molar ratio between lithium and sulfur in Li2S.
The formula unit for Li2S indicates that there are two lithium atoms for every sulfur atom. This means that the molar ratio between lithium and sulfur in Li2S is 2:1.
To calculate the amount of lithium needed, we can follow these steps:
Step 1: Find the molar mass of sulfur (S)
The molar mass of sulfur is found on the periodic table and is approximately 32.06 grams/mole.
Step 2: Convert the given mass of sulfur (29.1 g) to moles.
To convert grams to moles, divide the given mass by the molar mass:
moles of sulfur = 29.1 g / 32.06 g/mol = 0.907 moles
Step 3: Determine the moles of lithium needed.
Since the molar ratio between lithium and sulfur in Li2S is 2:1, we need twice the number of moles of sulfur for lithium.
moles of lithium = 2 * 0.907 moles = 1.814 moles
Step 4: Convert moles of lithium to grams.
To convert moles to grams, multiply the moles of lithium by its molar mass.
molar mass of lithium (Li) is approximately 6.94 g/mol.
grams of lithium = 1.814 moles * 6.94 g/mol = 12.6 grams
Therefore, 12.6 grams of lithium will combine with 29.1 grams of sulfur to form the compound Li2S.