2. Atoms & Elements

How many atoms of gold (Au) are present in 4 moles of gold?

If you have 24 grams of carbon (atomic mass = 12 g/mol), how many moles of carbon do you have?

What is the approximate mole fraction of neon (Ne) in dry air at sea level?

How many carbon atoms are in $1$ mole of carbon?

How many moles of Ba(NO3)2 are present in 0.25 L of a 2.00 M Ba(NO3)2 solution?

How many molecules are present in 23 moles of oxygen (O_2)?

Which of the following samples contains approximately 2 moles of particles?

How many atoms of carbon are present in 0.68 moles of carbon?

How many moles of Cl are present in one mole of CaCl2?

A 3.00 mole sample of K_2S contains how many atoms of potassium?

How many atoms are present in 179.0 g of iridium (Ir)? (Atomic mass of Ir = 192.2 g/mol)

How many phosphorus atoms are present in 158 kg of elemental phosphorus (P)?

Which of the following tasks most likely involves a calculation that uses moles?

How many atoms are present in a 12.0 g sample of lithium (Li)? (Atomic mass of Li = 6.94 g/mol)

What is the mass in grams of one mole of any pure substance called?