2. Atoms & Elements

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)

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?

How many xenon atoms are present in 2.36 moles of xenon (Xe)?

How many atoms are present in a 24 g sample of carbon (atomic mass = 12 g/mol)?