Question

Рассчитать массовую долю водорода в гидриде лития

Answer 1

M(LiH) = 8 г/моль

M(Li)= 7 г/моль

Массовая доля Li:

7*100% / 8 = 87,5 %.

Ответ: 87,5 %.

Answer 2

Calculating the Mass Fraction of Hydrogen in Lithium Hydride

To calculate the mass fraction of hydrogen in lithium hydride, we can use the formula:

Mass Fraction = (Mass of Hydrogen / Total Mass of Compound) x 100%

Let's calculate the mass fraction using the given information.

The molar mass of lithium hydride (LiH) is approximately 7.95 g/mol.

The molar mass of hydrogen (H) is approximately 1.008 g/mol.

Using the molar masses, we can calculate the mass fraction of hydrogen in lithium hydride.

Calculation

Mass Fraction of Hydrogen in Lithium Hydride: Mass of Hydrogen = 1.008 g/mol Total Mass of Lithium Hydride = 7.95 g/mol

Mass Fraction = (1.008 / 7.95) x 100%

Mass Fraction ≈ 12.67%

Therefore, the mass fraction of hydrogen in lithium hydride is approximately 12.67%.