The Math of Chemistry (A to Z)

Front

What is specific heat?

Back

Specific heat is the amount of heat required to raise the temperature of 1 gram of a substance by 1 degree Celsius.

Front

How do you calculate heat energy (Q)?

Back

Q = mass (m) × specific heat (c) × change in temperature (ΔT).

Front

Convert 276 Kelvin to Celsius.

Back

Celsius = Kelvin - 273.15; therefore, 276 K = 2.85 °C.

Front

What is the ideal gas law?

Back

The ideal gas law 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.

Front

How do you find the number of molecules in a gas?

Back

Use the formula: Number of molecules = (Volume in liters × 22.4 L/mol) × Avogadro's number (6.022 x 10^23 molecules/mol).

Front

What is partial pressure?

Back

Partial pressure is the pressure that a gas in a mixture would exert if it occupied the entire volume alone.

Front

How do you calculate the partial pressure of a gas in a mixture?

Back

Partial pressure = Total pressure × (mole fraction of the gas).

Front

What is percent error?

Back

Percent error = |(Experimental value - Theoretical value)| / Theoretical value × 100%.

Front

What is the significance of Avogadro's number?

Back

Avogadro's number (6.022 x 10^23) is the number of atoms, ions, or molecules in one mole of a substance.

Front

What is the relationship between temperature in Celsius and Kelvin?

Back

Temperature in Celsius = Temperature in Kelvin - 273.15.