Mole Concepts and Avogadro's Number

Which of the following statements regarding the mole is incorrect?

• A mole is a counting unit equal to 6.02 x 1023 particles.

• The number of particles in a mole is known as Avogadro’s number.

• A mole of particles of an element is numerically equal to the atomic mass of the element.

• none of the above

How many molecules are in 2.00 moles of H₂O?

• 124x10²⁴ molecules of H₂O
• 1.20x10²³ molecules of H₂O
• 1.20x10²⁴ molecules H₂O
• 124

State the type of mass you will obtain from the substance H2O.

State the type of mass you will obtain from the substance Si.

Tags

NGSS.HS-PS1-7

Compute for the mass of H2O.

What name is given to the number of atoms in a mole of an element?

• Planck's constant

• Avogadro's constant

• Newtonian constant

How many moles are there in 9 g of water?

• 2

• 1

• 0.5

What is the definition for Avogadro's number?

• number of grams per one mole of a substance
• whole number ratio that is a multiple of a chemical formula
• simplest, whole number ratio of a chemical formula
• 6.02 x 10^23 particles per one mole of a substance

Tags

NGSS.HS-PS1-7

Which would have more atoms?

• 1 mole of Li
• 1 mole of Au
• 1 mole of Si
• None, all are equal

A mole can be represented by the (SELECT ALL CORRECT ANSWERS)

• 22.4 liters of a gas at STP

• The amount of molecules or atoms in a substance

• Molar mass found on the periodic table of elements

• The amount of fission or fusion decay over time

Tags

NGSS.HS-PS1-7