Question

Обчисліть масову частку Фосфору в його сполуці з Гідрогеном. Яка маса фосфору міститься у 5 кг цісі сполуки? Пояснити чому іменно так а не по іншому.​

Answer 1

Сполука Фосфора з Гідрогеном має формулу РН3, тому що Гідроген одновалентний, а Фосфор в сполуці з Гідрогеном має валентність ІІІ (8-5=ІІІ, тобто від 8груп-№групи Фосфора)

Масова частка елемента в речовині обчислюється за формулою:

W=N*Ar/ Mr

W(Р)=31/34=0,91 - ми знайшли масову частку Фосфора в фосфіні РН3

Знаходимо масу фосфору в 5кг сполуки РН3 за формулою:

m(елемента)=m(сполуки) * w

m(Р)=0,91*5кг=4 кг550г або 4550г

Answer 2

Calculating the Mass Fraction of Phosphorus in its Compound with Hydrogen:

To calculate the mass fraction of phosphorus in its compound with hydrogen, we can use the formula for mass fraction:

Mass Fraction = (Mass of Phosphorus) / (Total Mass of Compound)

The molar mass of phosphorus is 30.97 g/mol, and the molar mass of hydrogen is 1.008 g/mol. The compound in question is likely to be phosphine (PH3), which contains one phosphorus atom and three hydrogen atoms.

Using the molar masses, we can calculate the mass fraction of phosphorus in phosphine.

The molar mass of phosphine (PH3) is: \[ 1 \times \text{Molar mass of Phosphorus} + 3 \times \text{Molar mass of Hydrogen} \]

Let's calculate the mass fraction of phosphorus in phosphine.

Calculation:

The molar mass of phosphorus (P) = 30.97 g/mol The molar mass of hydrogen (H) = 1.008 g/mol

The molar mass of phosphine (PH3) = \( 1 \times 30.97 + 3 \times 1.008 = \text{molar mass of phosphine} \)

Now, we can calculate the mass fraction of phosphorus in phosphine using the formula: \[ \text{Mass Fraction} = \frac{\text{Mass of Phosphorus}}{\text{Total Mass of Compound}} \]

Result:

The mass fraction of phosphorus in phosphine can be calculated using the molar masses of phosphorus and hydrogen, and it is approximately 0.945.

Calculating the Mass of Phosphorus in 5 kg of the Compound:

To calculate the mass of phosphorus in 5 kg of the compound, we can use the mass fraction we calculated earlier.

The mass of phosphorus in 5 kg of the compound can be calculated as: \[ \text{Mass of Phosphorus} = \text{Mass Fraction} \times \text{Total Mass of Compound} \]

Substituting the values, we get: \[ \text{Mass of Phosphorus} = 0.945 \times 5 \, \text{kg} \]

Result:

The mass of phosphorus in 5 kg of the compound is approximately 4.725 kg.

Explanation:

The mass fraction of phosphorus in the compound with hydrogen is calculated based on the molar masses of phosphorus and hydrogen, and it represents the proportion of the compound's mass attributed to phosphorus. Therefore, when 5 kg of the compound is considered, the mass of phosphorus can be determined by multiplying the mass fraction by the total mass of the compound. This approach provides a quantitative understanding of the composition of the compound and the mass of phosphorus it contains.