3 molecule of water contains how many grams?
To determine the number of grams in 3 molecules of water, you need to know the molar mass of water and then use the concept of Avogadro's number.
The molar mass of water is determined by adding the atomic masses of each atom present in the molecule. In water (H2O), there are two hydrogen (H) atoms and one oxygen (O) atom.
The atomic masses of hydrogen and oxygen are approximately 1 gram/mol and 16 grams/mol, respectively. To calculate the molar mass of water:
(2 * atomic mass of hydrogen) + atomic mass of oxygen
(2 * 1 g/mol) + 16 g/mol
2 g/mol + 16 g/mol
18 g/mol
Therefore, the molar mass of water is 18 grams per mole (g/mol).
Avogadro's number, denoted as 6.022 x 10^23, is the number of particles (atoms, molecules, or ions) in one mole.
Now, to calculate the number of grams in 3 molecules of water:
Step 1: Calculate the number of moles of water in 3 molecules.
To convert from molecules to moles, divide by Avogadro's number:
3 molecules / (6.022 x 10^23 molecules/mol) = 4.98 x 10^-24 moles
Step 2: Calculate the number of grams using the molar mass:
Number of grams = Number of moles * Molar mass
Number of grams = 4.98 x 10^-24 moles * 18 g/mol
Using scientific notation, the answer is approximately 8.96 x 10^-23 grams.
Therefore, 3 molecules of water contain approximately 8.96 x 10^-23 grams.