2. Atoms & Elements

Which of the following is equivalent to a mole of carbon atoms?

Why do chemists prefer using the mole instead of counting individual particles?

How many total atoms are present in 3 Na_2SO_4?

If you have 124 grams of sodium oxide (Na2O), how many moles of sodium oxide do you have?

Which equation correctly relates the number of moles of a solute (n) to its mass (m) and molar mass (M)?

How many atoms are present in 3 moles of chromium (Cr)?

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 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?