Question

Вычеслити массовую долю (в %) химического элемента лития в оксиде лития

Answer 1

Ответ: 43,8%
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Answer 2

Calculating the Mass Fraction of Lithium in Lithium Oxide

To calculate the mass fraction of lithium (Li) in lithium oxide (Li2O), we can use the molar masses of lithium and oxygen to determine the proportion of lithium in the compound.

The molar mass of lithium (Li) is approximately 6.94 g/mol, and the molar mass of oxygen (O) is approximately 16.00 g/mol.

Using this information, we can calculate the mass fraction of lithium in lithium oxide.

The formula for calculating the mass fraction of an element in a compound is:

Mass Fraction = (Molar Mass of Element) / (Molar Mass of Compound) * 100%

Substituting the molar masses of lithium and oxygen into the formula, we get:

Mass Fraction of Lithium in Lithium Oxide = (2 * 6.94 g/mol) / (2 * 6.94 g/mol + 16.00 g/mol) * 100%

Calculating this expression gives us the mass fraction of lithium in lithium oxide.

Let's calculate the mass fraction.