2. Atoms & Elements

What is the mass of sodium metal that contains 4.653 × 10^{19} Na atoms? (Atomic mass of Na = 22.99 g/mol)

How many atoms are present in 0.250 moles of Rb?

How many carbon atoms are present in one mole of 12C?

A sample contains 351 kg of calcium (Ca). How many moles of calcium are present in the sample? (Molar mass of Ca = 40.08 g/mol)

How many moles of atoms are present in 4.00 g of 13C?

A cup of water contains 13.9 moles of water. How many molecules of water are in the cup?

How many moles are present in 168 g of KOH?

Which of the following best represents the number of particles (atoms, molecules, or ions) present in one mole of a substance?

How many atoms of chlorine are present in 1.00 mol of chlorine gas (Cl_2)?

How many moles are present in 15.0 g of AsH_3 (arsine)? (Molar mass of AsH_3 = 77.95 g/mol)

How many atoms are present in 1.50 moles of Hg?

How many moles of H_2O are present in 360 grams of water?

How many moles of water are contained in 1.99 × 10^{26} molecules of water?

How many molecules are present in 3.25 mol of C2H6O?

Given that the molar mass of CO_2 is 44 g/mol, how many moles of CO_2 are present in 27 billion tons (2.7 × 10^{10} tons)? (1 ton = 1 × 10^6 g)