Question

В реакцию горения вступило 8 грамм фосфора , определите кол-во вещества оксида , массу оксида , кол -во молекул , которые содержатся в кислороде . Пожалуйста , срочно , умоляю !!!! Даю 50 баллов !

Answer 1

Дано
m(P)=8 g
------------------
n(P2O5)-?
m(P2O5)-?
N(O2)-?
 8                 X
4P+5O2-->2P2O5 M(P)=31 g/mol , M(P2O5)=142 g/mol
4*31            2*142
 8/ 124 = X / 284
X=18.32 g - P2O5
n(P2O5)=m(P2O5) / M(P2O5) = 18.32 / 142 = 0.129 mol 
  
По УХР находим массу кислорода
  8           Y
4P    +   5O2-->2P2O5 M(P)=31 g/mol , M(O2)=32 g/mol
4*31      5*32
8/31 = Y/160
Y=10.32 g - O2
N(O2)=m(O2) / M(O2) * N(A) = 10.32 / 32 *6.02*10^23=1.94*10^23 молекул
ответ n(P2O5)=0.129 mol
          m(P2O5)=18.32 g
        N(O2) = 1.94*10^23 молекул

Answer 2

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Answer 3

Reaction Details

When 8 grams of phosphorus undergoes combustion, we can determine the amount of substance of the oxide, the mass of the oxide, and the number of molecules containing oxygen.

Amount of Substance of Oxide

The molar mass of phosphorus is approximately 30.97 g/mol. To calculate the amount of substance of the oxide, we can use the balanced chemical equation for the combustion of phosphorus, which forms phosphorus pentoxide (P4O10).

The balanced chemical equation is: 4P + 5O2 -> P4O10

From the equation, we can see that 4 moles of phosphorus react with 5 moles of oxygen to produce 1 mole of P4O10.

Therefore, the amount of substance of the oxide formed by the combustion of 8 grams of phosphorus can be calculated using the following steps: 1. Convert the mass of phosphorus to moles. 2. Use the mole ratio from the balanced chemical equation to find the moles of the oxide.

Let's calculate the amount of substance of the oxide:

The molar mass of phosphorus is approximately 30.97 g/mol.

Mass of Oxide

The molar mass of phosphorus pentoxide (P4O10) can be calculated by adding the molar masses of the constituent elements (4 atoms of phosphorus and 10 atoms of oxygen).

Let's calculate the mass of the oxide:

The molar mass of phosphorus pentoxide (P4O10) is the sum of the molar masses of phosphorus and oxygen.

Number of Molecules Containing Oxygen

To find the number of molecules containing oxygen, we can use Avogadro's number, which states that 1 mole of any substance contains 6.022 x 10^23 molecules.

Let's calculate the number of molecules containing oxygen:

Using Avogadro's number, we can determine the number of molecules of oxygen in the calculated amount of substance of the oxide.

I'll proceed with the calculations.