2. Atoms & Elements

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

In chemistry, what does one mole represent?

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 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?