Mass, Volume & Mole Conversions

Front

What is the definition of a mole in chemistry?

Back

A mole is a unit of measurement used to express the amount of a substance, defined as exactly 6.022 x 10^23 particles (atoms, molecules, ions, etc.).

Front

How do you calculate the number of moles from volume at STP?

Back

Use the formula: Moles = Volume (L) / 22.4 L/mole. At STP, 1 mole of an ideal gas occupies 22.4 liters.

Front

What is the molar mass of a substance?

Back

The molar mass is the mass of one mole of a substance, typically expressed in grams per mole (g/mol).

Front

How do you convert moles to grams?

Back

Use the formula: Grams = Moles x Molar Mass.

Front

What is the relationship between mass, volume, and density?

Back

Density = Mass / Volume. This relationship helps in converting between mass and volume when the density is known.

Front

What is the ideal gas law?

Back

The ideal gas law is represented by the equation PV = nRT, where P is pressure, V is volume, n is the number of moles, R is the ideal gas constant, and T is temperature in Kelvin.

Front

How many moles are in 500 mL of an ideal gas at STP?

Back

0.022 moles (calculated using the formula: Moles = Volume (L) / 22.4 L/mole).

Front

What is the significance of STP in gas calculations?

Back

STP (Standard Temperature and Pressure) is defined as 0°C (273.15 K) and 1 atm pressure, providing a standard reference for gas calculations.

Front

How do you find the mass of a substance from moles?

Back

Multiply the number of moles by the molar mass of the substance.

Front

What is the formula to convert grams to moles?

Back

Moles = Grams / Molar Mass.