2. Atoms & Elements

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)?

How many sodium atoms are present in 0.2310 g of sodium (Na)?

How many grams of glucose (C6H12O6) are present in 3.55 moles of glucose?

How many moles are present in 3.01 × 10^{22} atoms of magnesium (Mg)?

1 mole of which of the following substances contains the largest number of atoms?

How many moles are present in 8.50 × 10^{24} molecules of sodium sulfate (Na_2SO_4)?

How many grams are present in a sample of calcium (Ca) that contains 2.71 × 10^{20} atoms?

A 30. gram sample of neon (Ne) is given. What is the total number of atoms present in this sample?

In chemistry, what does a mole represent a count of?

How many molecules are present in 48.0 grams of NaOH?

How many molecules are present in 2.50 moles of H_2O?

How many hydrogen atoms are present in 4 molecules of H_2O?