2. Atoms & Elements

How many atoms are present in 0.075 mol of titanium (Ti)?

How many atoms of hydrogen are present in 3.02 × 10^{22} molecules of NH_3?

If you have 33.6 L of neon gas at STP, how many moles of neon do you have?

How many atoms of Mg are present in 1.00 mole of magnesium?

How many moles are present in 10.0 mg of CO (carbon monoxide)?

How many moles are present in 8.5 × 10^{24} molecules of sodium sulfate (Na_2SO_4)?

What is the numeric value of a mole for atoms or molecules?

What is the approximate combined mole fraction of N_2 and O_2 in Earth's atmosphere?

How many sulfur atoms are present in 5.325 × 10^{-23} grams of sulfur (atomic mass of S = 32.07 g/mol)?

Which of the following samples contains the greatest number of atoms?

How many atoms of Cl are present in 6.1 mol of CCl_4?

Which of the following best describes Avogadro's number?

Which of the following samples contains the same number of atoms as 1 gram of He?

The chemical standard for the quantity of a mole is based on which substance?

Which of the following best represents the number of particles in one mole of a substance?