2. Atoms & Elements

Which of the following is the value of Avogadro's number?

How many atoms are present in a 591 g sample of gold (Au)? (Atomic mass of Au = 197 g/mol)

How many molecules of H_2O are present in 18.01 g (one mole) of water?

How many moles are present in 1 micromole?

How many atoms of hydrogen are present in 2.00 moles of methane (CH_4)?

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

Given that the molar mass of LiF is 25.94 g/mol, how many moles of LiF are present in a 10.37 g sample?

How many atoms are present in 2.0 moles of carbon?

A sample contains 0.25 mol of NaCl. How many formula units of NaCl are present in the sample?

One mole (mol) of glucose (molecular mass = 180 daltons) is:

How many molecules of ammonia (NH_3) are present in 10.4 moles of ammonia?

Which of the following is equal to one mole of calcium atoms?

What is the mass, in grams, of 3.09 × 10^{24} atoms of sulfur (atomic mass = 32.07 g/mol)?

What is the quantity, in moles, of KBr present in 60.0 mL of a 0.150 M KBr solution?

How many moles of carbon atoms are present in 1.22 moles of C6H12O6?