what is the mass in grams of one molecule of water... and is this one different from what is the mass in grans of one mole of water?
To calculate the mass in grams of one molecule of water, you need to know the molecular formula of water (H2O) and the atomic masses of hydrogen (H) and oxygen (O). The atomic masses are usually given on the periodic table.
The atomic mass of hydrogen (H) is approximately 1.008 grams per mole (g/mol), and the atomic mass of oxygen (O) is approximately 16.00 g/mol. The formula of water (H2O) indicates that each water molecule contains two hydrogen atoms and one oxygen atom.
To find the mass of one molecule of water, you add the atomic masses of two hydrogen atoms and one oxygen atom:
Mass of one molecule of water = (2 * atomic mass of hydrogen) + atomic mass of oxygen
= (2 * 1.008 g/mol) + 16.00 g/mol
= 2.016 g/mol + 16.00 g/mol
= 18.016 g/mol
So, the mass in grams of one molecule of water is approximately 18.016 grams.
Now, let's discuss the mass in grams of one mole of water. A mole is a unit that represents a specific number of particles, defined as Avogadro's number (6.022 x 10^23).
The molar mass of water (H2O) is equivalent to the sum of the atomic masses of hydrogen and oxygen in one mole. Using the atomic masses mentioned earlier, we can calculate this:
Molar mass of water = (2 * atomic mass of hydrogen) + atomic mass of oxygen
= (2 * 1.008 g/mol) + 16.00 g/mol
= 2.016 g/mol + 16.00 g/mol
= 18.016 g/mol
Hence, the mass in grams of one mole of water is also approximately 18.016 grams, which is the same as the mass of one molecule. This is because one mole of any substance contains Avogadro's number (6.022 x 10^23) of molecules or particles.