Calculate the number of molecules in 0.8g of O2 molecule.1.51×1023 molecules1.51×1022 molecules1.51×1021 molecules3.011×1022 molecules

To calculate the number of molecules in 0.8g of O2 molecule, we need to follow these steps:

1. First, we need to know the molar mass of O2. The atomic mass of Oxygen (O) is 16g/mol. Since O2 consists of 2 Oxygen atoms, the molar mass of O2 is 16g/mol * 2 = 32g/mol.

2. Next, we use the formula for moles which is Moles = mass / molar mass. Substituting the given mass (0.8g) and the molar mass we calculated (32g/mol), we get Moles = 0.8g / 32g/mol = 0.025 mol.

3. Finally, we use Avogadro's number (6.022 x 10^23), which is the number of molecules in one mole, to find the total number of molecules. So, the number of molecules = Moles * Avogadro's number = 0.025 mol * 6.022 x 10^23 = 1.51 x 10^22 molecules.

So, the correct answer is 1.51 x 10^22 molecules.