2. Atoms & Elements

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)

How many molecules are present in 4 moles of NH_3?

How many grams of aluminum are present in 3.0 moles of aluminum (Al)? (Atomic mass of Al = 27.0 g/mol)

How many moles of beryllium (Be) are present in 1.00 g of the element? (Atomic mass of Be = 9.01 g/mol)

The mole is based on the mass of 12 grams of ____.

Which statement correctly describes the quantities that can be determined if the number of moles of a substance is known?

How many moles are present in 2.85 × 10^{20} atoms of iron (Fe)?

A gas mixture contains 2.0 mol of N_2 and 3.0 mol of O_2. What is the mole fraction of N_2 in the mixture?

How many sulfur atoms are present in 0.45 mol of BaSO4?

How many molecules are present in 13.5 g of sulfur dioxide (SO_2)?

How many silver atoms are present in a 33.0 g bar of silver (Ag)? (Atomic mass of Ag = 107.9 g/mol)

How many atoms are present in 0.375 mol of palladium (Pd) atoms?