2. Atoms & Elements

Which statement is true about 0.25 mole of O_2 and 0.25 mole of NH_3?

How many moles of NaCl are present in 0.500 L of a 1.5 M NaCl solution?

Which of the following best describes the relationship between the mole and concentration in a solution?

Which statement best describes a mole in chemistry?

For which of the following items is the mole an appropriate unit of measurement?

How many atoms are present in 1 mole of silver (Ag)?

Which of the following statements correctly describes the mass of exactly 1 mole of an element?

How many atoms are present in one mole of atoms?

How many atoms are present in one mole of carbon?

How many moles of Cu are present in 1.48 × 10^{25} Cu atoms?

A mole is defined as the number of atoms in exactly 12 grams of which isotope?

What is the total number of molecules of hydrogen in 0.25 mole of hydrogen gas (H_2)?

How many moles of carbon (C) are present in 440 mg of carbon dioxide (CO_2)?

How many atoms are present in 1 mole of copper (Cu)?

A sample contains 18.0 g of water (H_2O). How many moles of molecules are present in this sample?