Question

Рассчитать массовую долю серы в сульфате лития

Answer 1

Пусть кол-во вещества сульфата лития Li2SO4 1 моль (1 моль • 110 г/моль = 110 г). Тогда из формулы можно сказать, что кол-во вещества лития 2 моль (14 г), серы 1 моль (32 г), кислорода 4 моль (64 г). Соответственно массовая доля серы равна 32 г / 110 г = 0,291, или 29,1%. Вот и ответ.

Answer 2

Calculating the Mass Fraction of Sulfur in Lithium Sulfate

To calculate the mass fraction of sulfur in lithium sulfate, we can use the chemical formula of lithium sulfate (Li2SO4) and the molar masses of lithium (Li) and sulfur (S) to determine the mass fraction of sulfur in the compound.

The molar mass of lithium sulfate (Li2SO4) can be calculated as follows: - Molar mass of lithium (Li) = 6.94 g/mol - Molar mass of sulfur (S) = 32.07 g/mol - Molar mass of oxygen (O) = 16.00 g/mol

Using these values, we can calculate the molar mass of lithium sulfate: - Molar mass of lithium sulfate (Li2SO4) = (2 * molar mass of lithium) + molar mass of sulfur + (4 * molar mass of oxygen)

Let's calculate the molar mass of lithium sulfate and then proceed to determine the mass fraction of sulfur in the compound.

The molar mass of lithium sulfate (Li2SO4) is calculated as follows: - Molar mass of lithium sulfate (Li2SO4) = (2 * 6.94 g/mol) + 32.07 g/mol + (4 * 16.00 g/mol)

Molar mass of lithium sulfate (Li2SO4) = 6.94 g/mol + 6.94 g/mol + 32.07 g/mol + 64.00 g/mol Molar mass of lithium sulfate (Li2SO4) = 109.95 g/mol

Now, let's calculate the mass fraction of sulfur in lithium sulfate using the molar mass of sulfur and the molar mass of lithium sulfate.

The mass fraction of sulfur in lithium sulfate is calculated as follows: - Mass fraction of sulfur = (molar mass of sulfur / molar mass of lithium sulfate) * 100%

Let's calculate the mass fraction of sulfur in lithium sulfate using the molar masses we've determined.

The mass fraction of sulfur in lithium sulfate is: - Mass fraction of sulfur = (32.07 g/mol / 109.95 g/mol) * 100% - Mass fraction of sulfur ≈ 29.16%

The mass fraction of sulfur in lithium sulfate is approximately 29.16%.