2. Atoms & Elements

How many atoms of Mg, O, and H are present in 3 formula units of Mg(OH)_2?

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

What is the numerical value of a mole, representing the number of atoms or molecules in one mole of a substance?

How many magnesium atoms are present in 1.00 mole of MgO?

In which field of science is the mole most commonly used as a unit of measurement?

How many moles of chloride ions are present in 2 moles of calcium chloride (CaCl_2)?

How many molecules are present in 0.500 mole of N_2O_5?

A typical penny has a mass of approximately 2.5 g and is primarily composed of copper. How many moles of copper atoms are present in a penny with a mass of 2.5 g? (Atomic mass of Cu = 63.55 g/mol)

If you have a mole of carbon atoms, which of the following statements is correct?

How many atoms of zinc are present in 0.60 mol of zinc?

What is the mass of 9.00 × 10^{22} molecules of NH_3?

How many moles are present in 82.5 grams of iron (Fe)? (Molar mass of Fe = 55.85 g/mol)

How many moles of Cu(NO3)2 are present in 2.35 L of a 2.0 M solution?

How many carbon atoms are present in 1 mole of carbon?