Question

Кислород объемом 4,48 л (н.у.) реагирует с литием, при этом образовался оксид лития (Li2O) массой 10,8 г. Определите выход продукта реакции

Answer 1

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Answer 2

Calculation of Reaction Yield

To determine the yield of the reaction between oxygen and lithium, we need to calculate the moles of lithium and oxygen involved in the reaction.

Given: - Volume of oxygen at standard conditions (n.u.): 4.48 L - Mass of lithium oxide (Li2O) formed: 10.8 g

First, we need to convert the volume of oxygen to moles using the ideal gas law. The molar volume of any gas at standard conditions (n.u.) is approximately 22.4 L/mol.

Step 1: Convert the volume of oxygen to moles:

Using the formula: moles = volume (L) / molar volume (L/mol)

moles of oxygen = 4.48 L / 22.4 L/mol = 0.2 mol

Next, we need to determine the moles of lithium involved in the reaction. The balanced chemical equation for the reaction between oxygen and lithium is:

4Li + O2 -> 2Li2O

From the balanced equation, we can see that 4 moles of lithium react with 1 mole of oxygen to produce 2 moles of lithium oxide.

Step 2: Calculate the moles of lithium:

moles of lithium = (moles of oxygen / 1) * (4 / 2) = 0.2 mol * 2 = 0.4 mol

Now that we know the moles of lithium involved in the reaction, we can calculate the theoretical yield of lithium oxide.

Step 3: Calculate the theoretical yield of lithium oxide:

The molar mass of lithium oxide (Li2O) is approximately 29.88 g/mol.

theoretical yield = moles of lithium * molar mass of Li2O theoretical yield = 0.4 mol * 29.88 g/mol = 11.952 g

Therefore, the theoretical yield of lithium oxide in this reaction is 11.952 grams.

Finally, we can calculate the yield of the reaction by dividing the actual mass of lithium oxide formed by the theoretical yield and multiplying by 100.

Step 4: Calculate the yield of the reaction:

yield = (actual mass of Li2O formed / theoretical yield) * 100 yield = (10.8 g / 11.952 g) * 100 = 90.25%

The yield of the reaction is approximately 90.25%.

Please note that the calculations provided are based on the given information and assumptions.