4.1 lecture 6

What is the unit of measurement for the mass of an atom?

Atomic mass unit (amu)

What is the numerical value of Avogadro’s number?

6.022 x 10^23

How many atoms are in 1 mole of any substance?

1 mole of anything contains 6.022 x 10^23 units of that substance.

What is the relationship between moles and grams for an element?

1 mol of an element corresponds to its molar mass in grams.

What is the molar mass of fluorine (F)?

19.00 g/mol

If you have 1.81 x 10^24 atoms of sulfur (S), how do you calculate the moles of S?

Use Avogadro’s number: 1 mol S = 6.022 x 10^23 atoms S.

What is the molar mass of sulfur (S) used in calculations?

32.06 g/mol

How do you convert grams to moles?

Use the formula: # moles (n) = mass (g) / molar mass (g/mole).

What does the formula mass of an element refer to?

The average mass of a single atom of that element in amu.

How many atoms are in 1.00 g of sulfur (S)?

1.88 x 10^22 atoms of S.

What is a mole in chemistry?

A mole is a unit that measures the amount of a substance, specifically 6.022 x 10^23 particles.

What is the molar mass of carbon (C)?

The molar mass of carbon is 12.01 g/mol.

How do you convert moles to grams?

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

What does the term 'empirical formula' refer to?

The empirical formula represents the simplest whole-number ratio of atoms in a compound.

What is the significance of Avogadro's number in chemistry?

Avogadro's number allows chemists to count particles by weighing them, linking moles to the number of atoms or molecules.