How is molar mass determined using the ideal gas law and experimental data?

To find a gas's molar mass, use the ideal gas law PV=nRT. Measure pressure (P), volume (V), and temperature (T), then calculate moles (n) using the gas mass and molar mass. Rearrange to solve for molar mass.

If the pressure is expressed in kPa and volume in dm3, why can the same value of R (from the previous flash card) be used?

Because the two conversion factors (103 for kPa to Pa and 10–3 for dm3 to m3) cancel each other out.

Intermediate

If all parameters are expressed in standard SI units (p in Pa, V in m3, T in K and n in mol), what is the value of R?

Intermediate

R≈8.31JK–1mol–1.

Intermediate

What does the symbol 'R' represent in the ideal gas law equation?

Intermediate

R represents the universal gas constant in the ideal gas equation, used in calculations involving the properties of ideal gases.

Intermediate

What is the ideal gas equation?

Intermediate

pV=nRT

Easy

True or False: The constant value of the expression $$\frac{pV}{T}$$ is proportional to the amount of gas, represented by 'n'.

Easy

True.

Easy

What is the expression that suggests the change in parameters p, V, or T affects the other two such that the expression remains constant?

Easy

$$\frac{pV}{T}$$ remains constant.

Intermediate

Why is variable control important in a gas experiment setup?

Intermediate

Variable control is crucial to ensure that changes in the experiment are due to the tested independent variable, not outside influences.

Easy

In a science experiment, what variable do you, the experimenter, change or manipulate?

Easy

The independent variable.