4. How would you convert 9.0 grams of water to moles?
To convert grams of a substance to moles, you need to use its molar mass.
For water (H₂O), the molar mass can be calculated by summing the atomic masses of its constituent elements. The atomic mass of hydrogen (H) is approximately 1.01 grams/mole, and the atomic mass of oxygen (O) is approximately 16.00 grams/mole.
So, calculating the molar mass of water:
(2 * 1.01 g/mol) + (1 * 16.00 g/mol) = 18.02 g/mol
Now that you have the molar mass of water, you can use it to convert grams to moles.
Given that you have 9.0 grams of water, you can set up a proportion using the molar mass:
(9.0 g water) * (1 mol water / 18.02 g water) = x moles water
Simplifying the equation:
x = (9.0 g water) / (18.02 g/mol)
Evaluating the expression:
x = 0.50 moles
Therefore, 9.0 grams of water is equivalent to 0.50 moles of water.