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 the same number of entities (atoms, molecules, etc.) as there are in 12 grams of carbon-12.

Front

What is Avogadro's number?

Back

Avogadro's number is 6.02 x 10^23, which is the number of atoms, molecules, or particles in one mole of a substance.

Front

How do you convert grams to moles?

Back

To convert grams to moles, divide the mass of the substance (in grams) by its molar mass (in grams per mole). Formula: Moles = Mass (g) / Molar Mass (g/mol).

Front

What is the molar mass of zinc (Zn)?

Back

The molar mass of zinc (Zn) is approximately 65.4 g/mol.

Front

How many atoms are in 1 mole of any substance?

Back

1 mole of any substance contains 6.02 x 10^23 atoms or molecules.

Front

How do you calculate the number of atoms in a given mass of an element?

Back

To calculate the number of atoms in a given mass, first convert the mass to moles using the molar mass, then multiply the number of moles by Avogadro's number. Formula: Atoms = Moles x Avogadro's number.

Front

What is the relationship between grams and moles?

Back

The relationship is defined by the formula: Grams = Moles x Molar Mass.

Front

How do you convert pounds to grams?

Back

To convert pounds to grams, multiply the weight in pounds by 453.592 (since 1 pound = 453.592 grams).

Front

What is scientific notation?

Back

Scientific notation is a way of expressing numbers that are too large or too small to be conveniently written in decimal form. It is written as a number between 1 and 10 multiplied by a power of 10.

Front

Convert 1,079,000,000,000,000 to scientific notation.

Back

1,079,000,000,000,000 in scientific notation is 1.079 x 10^15.