Calculate Each of The Following Quantities in 2.00 Moles H3po4

This guide explains how to calculate key quantities for 2.00 moles of phosphoric acid (H3PO4), including mass, volume, and molar mass. The calculator provides quick results while the detailed explanation covers the chemistry and practical applications.

Formula and Calculation

The key formula for calculating quantities of H3PO4 is the molar mass calculation:

Molar Mass (g/mol) = Sum of atomic masses of all atoms in the formula H3PO4 = (3 × H) + P + (4 × O) = (3 × 1.008) + 30.974 + (4 × 15.999) = 3.024 + 30.974 + 63.996 = 97.994 g/mol

Once you have the molar mass, you can calculate other quantities using these formulas:

Mass (g) = Moles × Molar Mass Volume (L) = Mass / Density (if density is known) Moles (mol) = Mass / Molar Mass

Note: The density of H3PO4 solutions varies with concentration. For pure H3PO4, density is approximately 1.88 g/cm³.

Example Calculation

Let's calculate the mass of 2.00 moles of H3PO4:

Determine the molar mass of H3PO4: 97.994 g/mol (as calculated above)
Multiply moles by molar mass: 2.00 mol × 97.994 g/mol = 195.988 g
Round to appropriate significant figures: 196 g (if using 2 significant figures)

Therefore, 2.00 moles of H3PO4 has a mass of approximately 196 grams.

Interpreting Results

The calculated quantities provide several important insights:

Mass: Shows how much physical material you're working with
Volume: Helps determine container sizes for solutions
Moles: Indicates the amount of chemical reaction potential

These calculations are essential for chemistry experiments, industrial processes, and laboratory preparations where precise measurements of phosphoric acid are required.

FAQ

What is the molar mass of H3PO4?: The molar mass of H3PO4 is approximately 97.994 g/mol, calculated by summing the atomic masses of hydrogen, phosphorus, and oxygen atoms in the molecule.
How do I calculate the mass of H3PO4 from moles?: Multiply the number of moles by the molar mass (97.994 g/mol) to get the mass in grams. For example, 2.00 moles × 97.994 g/mol = 195.988 g.
What is the density of H3PO4?: The density of pure H3PO4 is approximately 1.88 g/cm³. For solutions, density varies with concentration and should be measured experimentally.
Why is H3PO4 important in chemistry?: H3PO4 is a common acid used in fertilizers, food processing, and industrial cleaning. It's also important in biological systems as a component of DNA and RNA.