2. Atoms & Elements

Fill in the blank: A mole is defined as the number of carbon atoms in __________ g of pure C-12.

How many moles of silver atoms are present in 1.8 × 10^{20} atoms of silver?

One atom of gold weighs 3.27 × 10^{-13} ng. How many gold atoms are present in 1.0 g of gold?

How many moles are present in 2.5 g of N_2?

How many molecules of glycine are present in 1.0 mole of glycine?

How many carbon atoms are present in 5.50 g of C?

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?