Front

What is the empirical formula if you have 88.80% copper and 11.20% oxygen?

Back

Cu₂O

Front

Which has a greater mass: 1 mole of scandium or 2 moles of boron?

Back

Scandium has a greater mass.

Front

What is the molecular formula if the empirical formula is C₂H₅ and the molecular molar mass is 58.14 g/mol?

Back

C₄H₁₀

Front

What is the mass of 2.50 mol of oxygen gas?

Back

80 g

Front

The number 6.02 x 10²³ is ______.

Back

Avogadro's number

Front

Define molar mass.

Back

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

Front

What is the relationship between moles and mass?

Back

Mass (g) = Moles × Molar Mass (g/mol).

Front

How many molecules are in 1 mole of a substance?

Back

6.02 x 10²³ molecules.

Front

What is the formula to calculate the number of moles?

Back

Moles = Mass (g) / Molar Mass (g/mol).

Front

What is the significance of Avogadro's number?

Back

It represents the number of particles (atoms, molecules) in one mole of a substance.