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CHEMISTRY / COLLIGATIVE PROPERTIES

Molar Mass from Osmotic Pressure Calculator

Estimate solute molar mass from osmotic pressure data. Review the equation, substituted values, assumptions, and result in one guided chemistry workspace.

  • 01 Calculated in this tab
  • 02 Values stay in this browser tab
  • 03 Use boundary

Conversion input

Known value

Filter by unit name, symbol, or code. Your current selections remain available.

Equation inputs

Preparing the calculator...

Use boundary

Calculation path

Estimate solute molar mass from osmotic pressure data. The page evaluates the displayed equation from your supplied values and presents both symbolic and substituted KaTeX working so the arithmetic can be checked.

Calculation path

M=i mRT/(Pi V)

What you provide

What you provide

  • Dissolved solute mass expressed in g, using the same scenario as the other inputs
  • Gas constant expressed in L atm/(mol K), using the same scenario as the other inputs
  • Absolute temperature expressed in K, using the same scenario as the other inputs
  • Solution volume expressed in L, using the same scenario as the other inputs
  • Osmotic pressure expressed in atm, using the same scenario as the other inputs
  • Van t Hoff factor, using the same scenario as the other inputs

What you receive

What you receive

  • Estimated molar mass in g/mol from the stated equation
  • A symbolic formula plus substituted working with your values
  • Visible assumptions, field guidance, and an authoritative learning reference

Use boundary

Choose the maximum decimal places shown. This does not increase source accuracy.

The solution is dilute and ideal, temperature is absolute, and the van t Hoff factor is appropriate.

Use internally consistent units and retain extra precision when carrying the result into another calculation.

Reviewed reference factors

Reviewed reference factors

OpenStax Chemistry 2e

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