Density Quiz: Take the Density Test with Flashcards

Questions and Answers

$Density = \frac{Mass}{Volume}$

Gram (g) or Kilogram (kg)

In cubic meters

Gases have constant motion Signup and view all the answers

By dividing the mass of the gas by its volume Signup and view all the answers

$PV = nRT$ Signup and view all the answers

Gas constant Signup and view all the answers

By substituting the number of moles with mass divided by molar mass Signup and view all the answers

Sum of atomic masses in a chemical formula Signup and view all the answers

Isolate the density on the left-hand side of the equation Signup and view all the answers

Study Notes

Gases are more difficult to compute density for because their molecules are widely spaced, making it harder to measure their volume accurately.
The density of a gas is calculated using the ideal gas law equation.

The ideal gas law equation is PV = nRT, where P is pressure, V is volume, n is the number of moles, R is the gas constant, and T is temperature in Kelvin.
In the ideal gas law equation, the variable R represents the gas constant (approximately 8.3145 J/mol·K).

To introduce the density parameter, the ideal gas law equation can be modified to PV = mRT/M, where M is the molar mass of the gas.
The formula for the molar mass of a substance is the sum of the atomic masses of its constituent atoms.
The ideal gas law equation can be modified to calculate the density of a gas by rearranging the equation to density (ρ) = m/V = PM/RT.