How do I determine the number of grams for the following substance: 2.40 mol O2?
1mol =16 gO
2.40 mol O2* (32gO2/1molO2)
=76.8gO2
grams = mols x molar mass
To determine the number of grams for a substance, you need to use its molar mass. The molar mass represents the mass of one mole of a substance, and it is expressed in grams per mole (g/mol).
To find the molar mass of O2, you need to look up the atomic masses of oxygen. Since there are two oxygen atoms in a molecule of O2, you multiply the atomic mass of oxygen by 2. The atomic mass of oxygen is approximately 16.00 atomic mass units (amu).
So, the molar mass of O2 is: 2 * 16.00 g/mol = 32.00 g/mol.
Next, you can use the given information of 2.40 mol O2 to calculate the number of grams. To do this, multiply the number of moles by the molar mass:
2.40 mol O2 * 32.00 g/mol = 76.80 grams.
Therefore, 2.40 mol O2 is equivalent to 76.80 grams.