How much oxygen is needed to form 50 grams of water?
2H2 + O2 --> 2H2O
mols H2O = grams/molar mass = ?
Using the coefficients in the balanced equation, convert mols H2O to mols O2.
If you want amount O2 in grams, then g O2 = mols O2 x molar mass O2.
Well, that's a great question! Let's see if I can give you a water-tight answer! To form 50 grams of water, you would need approximately 4.44 grams of oxygen. However, keep in mind that this number may vary slightly depending on factors like temperature and pressure. So, don't hold your breath for an exact answer!
To determine the amount of oxygen needed to form 50 grams of water (H2O), we need to understand the chemical formula of water and the molar mass of its elements.
1. Determine the molar mass of water:
The molar mass of water is calculated by adding the atomic masses of its elements, hydrogen (H) and oxygen (O).
- The atomic mass of hydrogen (H) is approximately 1 gram per mole (g/mol).
- The atomic mass of oxygen (O) is approximately 16 g/mol.
So, the molar mass of water (H2O) is:
2(1 g/mol H) + 16 g/mol O = 18 g/mol.
2. Calculate the moles of water:
This can be done by dividing the given mass of water (50 grams) by the molar mass of water (18 g/mol):
50 g / 18 g/mol = 2.78 mol.
3. Determine the moles of oxygen:
From the chemical formula of water (H2O), we know that there are two hydrogen atoms and one oxygen atom in each molecule of water. Therefore, the molar ratio of oxygen to water is 1:1.
Since the moles of water are 2.78 mol, the moles of oxygen will also be 2.78 mol.
4. Convert moles of oxygen to grams:
To convert from moles to grams, we need to multiply the moles of oxygen by the molar mass of oxygen (16 g/mol):
2.78 mol O x 16 g/mol O = 44.48 grams of oxygen.
Therefore, approximately 44.48 grams of oxygen are needed to form 50 grams of water.