Question

Дано:M(P)=6,2 грамм найти P2O5

Answer 1

M(P)=6,2г
M(P)=31г/моль
M(P2O5)=142г/моль
m(P2O5)-?

n(P)=n(P2O5)
n(P)=6,2/31=0,2моль
m(P2O5)=142*0,2=28,4г
Ответ:28,4г

Answer 2

P2O5 represents the molecular formula for diphosphorus pentoxide, which is a chemical compound. In order to find the mass of P2O5, we need to determine the molar mass of this compound.

To calculate the molar mass of P2O5, we need to know the atomic masses of phosphorus (P) and oxygen (O). The atomic mass of phosphorus is approximately 30.97 grams per mole, while the atomic mass of oxygen is approximately 16 grams per mole.

The molecular formula P2O5 indicates that there are two phosphorus atoms and five oxygen atoms in each molecule of diphosphorus pentoxide. To find the molar mass, we can multiply the atomic masses of each element by its respective subscript and sum up the results:

Molar mass of P2O5 = (2 * atomic mass of P) + (5 * atomic mass of O)

Substituting the atomic masses:

Molar mass of P2O5 = (2 * 30.97 g/mol) + (5 * 16 g/mol)

Calculating the values:

Molar mass of P2O5 = 61.94 g/mol + 80 g/mol

Molar mass of P2O5 = 141.94 g/mol

Now that we have determined the molar mass of P2O5, we can use the given mass of M(P) = 6.2 grams to find the mass of P2O5. To do this, we will use the concept of molar ratios.

The molar ratio allows us to convert between the mass of a substance and its molar quantity. In this case, we want to convert from grams of P2O5 to moles of P2O5, and then from moles of P2O5 to grams of P2O5.

To convert from grams to moles, we use the molar mass as a conversion factor:

moles of P2O5 = (grams of P2O5) / (molar mass of P2O5)

Substituting the given mass:

moles of P2O5 = 6.2 g / 141.94 g/mol

Calculating the value:

moles of P2O5 ≈ 0.0436 mol

Now that we have the moles of P2O5, we can convert back to grams using the molar mass:

grams of P2O5 = (moles of P2O5) * (molar mass of P2O5)

Substituting the calculated moles:

grams of P2O5 ≈ 0.0436 mol * 141.94 g/mol

Calculating the value:

grams of P2O5 ≈ 6.19 g

Therefore, the mass of P2O5 is approximately 6.19 grams.