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how many molecules of white phosphorus p4 are contained in 248g of the substance



Sagot :

hi,

To determine the number of molecules in a given mass of a substance, you can use the concept of moles. The formula for calculating the number of moles is:

Number of moles = Mass (g) / Molar mass (g/mol)

For white phosphorus (P4), the molar mass is the sum of the atomic masses of the individual phosphorus atoms:

Molar mass of P4  = 4 × Atomic mass of phosphorus

The atomic mass of phosphorus (P) is approximately 30.97 g/mol

Molar mass of P4 = 4 × 30.97 g/mol

Now, you can use the formula to find the number of moles:

Number of moles = 248 g / (4 × 30.97 g/mol)

Calculate the result.

Once you have the number of moles, you can use Avogadro's number (6.022 × 10^23 mol^−1 ) to find the number of molecules:

Number of molecules = Number of moles × 6.022 × 10^23

Calculate the final result.