How many molecules are 100.00 grams of H2O?
How many moles do you have?
100g/molar mass H2O = ?? moles.
There are 6.022E23 molecules in 1 mole of anything. And you have ?? moles.
200
100.00g H2O*(1mol H2O/18.02g H2O)*(6.022*10^23 molecules H2O/1 mol H2O)=3.3418423*10^24 molecules H2O or ~3.3418*(10^24) H2O molecules.
To determine the number of molecules in 100.00 grams of H2O, we can use the concept of moles.
Step 1: Calculate the molar mass of H2O
The molar mass of H2O can be calculated by adding up the atomic masses of each element in the compound.
Molar mass of hydrogen (H) = 1.008 g/mol
Molar mass of oxygen (O) = 16.00 g/mol
Therefore, the molar mass of H2O = (2 × 1.008 g/mol) + 16.00 g/mol = 18.016 g/mol
Step 2: Calculate the number of moles
To calculate the number of moles, we divide the given mass of H2O by its molar mass.
Number of moles = Mass (in grams) / Molar mass (in g/mol)
Number of moles = 100.00 g / 18.016 g/mol
Step 3: Calculate the number of molecules
Avogadro's number states that there are 6.022 × 10^23 particles (atoms, molecules) in one mole of any substance.
Number of molecules = Number of moles × Avogadro's number
Number of molecules = (100.00 g / 18.016 g/mol) × (6.022 × 10^23 molecules/mol)
Now, calculate the number of molecules using the given values.