How many molectules are in a 64.3 mg sample of tetraphosphorus decoxide, P4O10?

To calculate the number of molecules in a sample of tetraphosphorus decoxide (P4O10), you can use the concept of moles and Avogadro's number.

Step 1: Calculate the number of moles of P4O10.
To do this, you need to divide the mass of the sample by the molar mass of P4O10.

The molar mass of P4O10 can be calculated as:
(4 * molar mass of phosphorus) + (10 * molar mass of oxygen)

The molar mass of phosphorus (P) is 30.97 g/mol.
The molar mass of oxygen (O) is 16.00 g/mol.

Therefore, the molar mass of P4O10 is:
(4 * 30.97 g/mol) + (10 * 16.00 g/mol)

Step 2: Divide the mass of the sample by the molar mass to obtain the number of moles.
Dividing the given mass (64.3 mg) by the molar mass calculated in step 1 will give you the number of moles of P4O10.

Step 3: Calculate the number of molecules using Avogadro's number.
Avogadro's number is 6.022 x 10^23 molecules/mol.
Multiply the number of moles calculated in step 2 by Avogadro's number to determine the number of molecules.

Following these steps, you can calculate the number of molecules in the given sample of tetraphosphorus decoxide (P4O10).

To determine the number of molecules in a sample of tetraphosphorus decoxide (P4O10), you need to use the concept of Avogadro's number and the molar mass of the compound.

First, we need to find the molar mass of P4O10. This can be calculated by adding up the atomic masses of each element in the compound. Phosphorus (P) has an atomic mass of approximately 31.0 grams per mole, while oxygen (O) has an atomic mass of approximately 16.0 grams per mole.

The molar mass of tetraphosphorus decoxide (P4O10) can be calculated as follows:
(4 * 31.0 g/mol) + (10 * 16.0 g/mol) = 123.96 g/mol

Now, we can use the molar mass to calculate the number of moles in the given sample. Given that the sample has a mass of 64.3 mg, we need to convert this to grams by dividing by 1000:
64.3 mg ÷ 1000 = 0.0643 g

Next, we can use the molar mass to calculate the number of moles:
0.0643 g / 123.96 g/mol = 0.000519 mol

Finally, we can use Avogadro's number, which is approximately 6.022 x 10^23 molecules/mol, to determine the number of molecules in the sample. Multiply the number of moles by Avogadro's number:
0.000519 mol * 6.022 x 10^23 molecules/mol = 3.126 x 10^20 molecules

Therefore, there are approximately 3.126 x 10^20 molecules in a 64.3 mg sample of tetraphosphorus decoxide (P4O10).

How many mols P4O10? That's grams/molar mass. That x 6.02E23 = number of molecules P4O10.

Then there are 4 P atoms and 10 O atoms (total 14) in 1 molecule so ......