2. Atoms & Elements

Which contains more atoms: 1 mole of carbon or 1 mole of sulfur?

Which of the following statements best describes a mole in chemistry?

How many moles of He gas are present in 500 L at standard temperature and pressure (STP)?

What is the total number of moles of atoms present in 1 mole of NH_3?

An aluminum can has a mass of 15.8 grams. How many aluminum atoms are in this can? (Atomic mass of Al = 26.98 g/mol)

Which of the following solutions contains the greatest number of moles of H+(aq) ions?

How many atoms of gold (Au) are present in a 90.2-g sample? The molar mass of gold is 197.0 g/mol.

If you have 0.5 moles of NaCl, how many formula units of NaCl do you have?

What is the total number of atoms present in 1.0 mole of CO_2?

In the context of the mole concept, how many particles (atoms, molecules, or ions) are present in one mole of any element or compound?

How many moles are present in 3.55 × 10^{22} formula units of NaCl?

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

If you produced 5 moles of Ca3(PO4)2, how many moles of calcium ions (Ca^{2+}) are present?

How many molecules are present in 3.6 grams of NaCl?

How many moles are present in 2.5 g of N_2?