Mole Concept w/ Problems

The Avogadro’s number is named after the Italian scientist ________.

• Amedeo Avogadro

• Armando Avogadro

• Amethyst Avogadro

• Alexander Avogadro

What is the molar mass of the element helium?

• 4 %

• 4 mol

• 4 g/mol

• 4 g

A mole of a substance contains ___ particles.

• 60.2x10²³

• 6.02x10²³

• 60.2x10²⁴

• 6.02x10²⁴

Tags

NGSS.HS-PS1-7

Which of the following does not belong to the group?

• Mole

• Pieces

• Dozen

• Pair

The ___________ is considered to be the simplest formula of a compound.

• Molecules

• Molecular formula

• Empirical formula

• Percentage composition

The _______ is equal to the ratio between the total mass of an element in the compound and the molar mass of the compound multiplied by 100.

• Molecules

• Molecular formula

• Empirical formula

• Percentage composition

The _____ gives the actual number of atoms present in any given compound.

• Molar mass

• Percentage composition

• Empirical formula

• Molecular formula

Which of the following is written in an empirical formula?

• C₄H₅ON₂

• C₆H₁₂O₆

• C₄H₁₀

• H₂O₂

Tags

NGSS.MS-PS1-1

How many formula units are there in 1.464 mole of zinc arsenate (Zn₃(AsO₄)₂?

• 2.431 x 10²⁴ atoms

• 8.832 x 10²³ atoms

• 6.22 x 10²³ atoms

• 6.022 x 10²³ atoms

How many calcium atoms are in 0.250 moles of calcium?

• 3.09 x 10²³ Ca atoms

• 1.51 x 10²³ Ca atoms

• 2.03 x 10²³ Ca atoms

• 2.56 x 10²³ Ca atoms