2. Atoms & Elements

Which of the following samples of N_2 contains the greatest mass?

How many moles are present in 35 g of H_2O?

Which of the following statements about the mole concept is NOT correct?

How many moles of nitrogen atoms (N) are present in 0.245 g of dinitrogen monoxide (N_2O)?

How many moles are present in 15 grams of lithium (Li)? (Atomic mass of Li = 6.94 g/mol)

How many atoms are in one mole of gold (Au)?

What mass of sulfur (S) contains exactly 4.7 × 10^{22} atoms of sulfur?

How many silicon atoms are present in 4 molecules of SiH_4?

Which of the following best describes the relationship between moles and particles in chemistry?

How many atoms of neon are present in 0.378 g of neon (Ne)?

How many moles are present in 199 grams of CCl_4?

How many molecules are present in 4.00 moles of glucose (C_6H_{12}O_6)?

How many moles are present in 22 grams of argon (Ar)? (Atomic mass of Ar = 39.95 g/mol)

A sample contains 18.0 g of water (H_2O). What is the number of moles present in the sample?

Which value approximately represents the number of atoms in one mole of gold?