2. Atoms & Elements

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)

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)?