2. Atoms & Elements

What is the mole ratio of hydrogen (H) to nitrogen (N) in the ammonia molecule (NH_3)?

Which of the following samples contains a total of 9.0 × 10^{23} atoms?

How many moles of copper (Cu) are required to produce 1 mole of copper(I) oxide (Cu2O)?

If you have 3 moles of O_2, how many molecules of oxygen gas do you have?

How many moles of atoms are present in 6.00 g of 13C?

How many atoms are present in 1 mole of a substance?

How many molecules are present in 345 grams of carbon dioxide (CO_2)?

Which statement best compares 1 mol of sodium chloride (NaCl) to 1 mol of aluminum chloride (AlCl_3)?

Which term is also known as a mole in chemistry?

How many atoms are present in 13.2 moles of copper (Cu)?

If you have 149 grams of potassium chloride (KCl), how many moles of KCl do you have?

A pure silver ring contains 2.80 × 10^{22} silver atoms. How many moles of silver atoms does it contain?

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

How many moles are present in 5.62 g of water (H_2O)?

How many moles of nitrogen atoms (N) are present in 0.203 g of N_2O?