Mole Conversions

Front

What is a mole in chemistry?

Back

A mole is a unit of measurement used to express the amount of a substance. It is defined as the amount of substance that contains as many entities (atoms, molecules, ions, etc.) as there are in 12 grams of carbon-12.

Front

How do you convert grams to moles?

Back

To convert grams to moles, use the formula: Moles = Mass (g) / Molar Mass (g/mol).

Front

What is the molar mass of diphosphorus pentaoxide (P2O5)?

Back

The molar mass of diphosphorus pentaoxide (P2O5) is approximately 142.0 g/mol.

Front

How many moles are in 86.235 g of diphosphorus pentaoxide?

Back

Using the formula: Moles = Mass / Molar Mass, Moles = 86.235 g / 142.0 g/mol = 0.60755 moles.

Front

What is the molar mass of cobalt (Co)?

Back

The molar mass of cobalt (Co) is approximately 58.93 g/mol.

Front

How many moles are in 48.86 g of cobalt?

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Using the formula: Moles = Mass / Molar Mass, Moles = 48.86 g / 58.93 g/mol = 0.8291 moles.

Front

What is a formula unit in chemistry?

Back

A formula unit is the lowest whole number ratio of ions in an ionic compound, representing the simplest form of the compound.

Front

How do you calculate the number of formula units in a sample?

Back

To calculate the number of formula units, first convert grams to moles, then multiply by Avogadro's number (6.022 x 10^23).

Front

How many formula units are in 25.69 g of calcium chloride (CaCl2)?

Back

Using the molar mass of CaCl2 (110.98 g/mol), Moles = 25.69 g / 110.98 g/mol = 0.2315 moles. Number of formula units = 0.2315 moles x 6.022 x 10^23 = 1.394 x 10^23 F.U.'s.

Front

What is Avogadro's number?

Back

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