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Water Molar Mass Calculation:
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The water volume to moles calculation converts a given volume of water (in milliliters) to the number of moles using water's molar mass. This is based on the density of water and its molecular weight.
The calculator uses the formula:
Where:
Explanation: This calculation assumes water has a density of 1 g/mL at standard conditions, so volume in mL equals mass in grams. Dividing by the molar mass (18.015 g/mol) gives the number of moles.
Details: Calculating moles from volume is essential in chemistry for stoichiometric calculations, solution preparation, and quantitative analysis. It's particularly important in aqueous chemistry where water is the solvent.
Tips: Enter the volume of water in milliliters. The value must be greater than 0. The calculator will automatically compute the corresponding number of moles.
Q1: Why is the molar mass of water 18.015 g/mol?
A: Water (H₂O) has a molar mass of approximately 18.015 g/mol, which is the sum of atomic masses: 2 hydrogen atoms (1.008 × 2) and 1 oxygen atom (16.00).
Q2: Does temperature affect this calculation?
A: Yes, water density changes with temperature. This calculation assumes standard conditions (approximately 4°C where density is 1.000 g/mL). For precise work at other temperatures, corrections may be needed.
Q3: Can I use this for other liquids?
A: No, this calculation is specific to water. Other liquids have different densities and molar masses, requiring different conversion factors.
Q4: What if my water contains impurities?
A: Impurities change the density and composition. This calculation is for pure water only. For solutions, you would need to account for the solute concentration.
Q5: How accurate is this calculation?
A: For most laboratory purposes with pure water at room temperature, this calculation provides sufficient accuracy. For highly precise work, temperature-corrected density values should be used.