2. Atoms & Elements

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

How many iron atoms are contained in 354 g of iron, given that the molar mass of iron is 55.85 g/mol?

In the mole concept, what does 1 mole of any substance represent?

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.

Which statement best describes a mole in chemistry?

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?

How do you calculate the moles of a gas in a solution when given its volume at standard temperature and pressure (STP)?