2. Atoms & Elements

One mole of which of these compounds contains two moles of hydrogen atoms?

How many atoms are present in 12 grams (1 mole) of carbon-12?

How many moles are present in 7.5 × 10^{19} molecules of ammonia (NH_3)?

How many molecules are present in 2.50 moles of O_2?

Which of the following solutions contains the same number of moles of KCl as 75.00 mL of a 0.250 M solution of KCl?

One mole of particles of any substance contains how many particles?

How many atoms of Mg, O, and H are present in 3 formula units of Mg(OH)_2?

How many atoms are present in one mole of a substance?

What is the numerical value of a mole, representing the number of atoms or molecules in one mole of a substance?

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

In which field of science is the mole most commonly used as a unit of measurement?

How many moles of chloride ions are present in 2 moles of calcium chloride (CaCl_2)?

How many molecules are present in 0.500 mole of N_2O_5?

A typical penny has a mass of approximately 2.5 g and is primarily composed of copper. How many moles of copper atoms are present in a penny with a mass of 2.5 g? (Atomic mass of Cu = 63.55 g/mol)