2. Atoms & Elements

What is the molar mass of aluminum (Al)?

What is the concentration of H^+ ions in a 0.010 M aqueous solution of sulfuric acid (H_2SO_4), assuming complete dissociation?

What is the mass in grams of 0.250 mol of the common antacid calcium carbonate (CaCO_3)?

How many nitrogen atoms are present in 15.0 grams of Pb(NO2)2?

What is the molar mass of water (H_2O) in a hydrate, expressed in g/mol?

What is the molar mass of chlorine gas (Cl_2)?

Which of the following steps is necessary to convert the mass of a sample of NaCl to the number of NaCl formula units present?

Which of the following is the correct molar mass (to two decimal places) of CH3OCH3 (dimethyl ether)?

What is the mass (in grams) of 10.00 L of propane vapor (C3H8) at standard temperature and pressure (STP)?

How many grams of Fe_2O_3 are present in 0.500 mole of Fe_2O_3?

What is the mass, in grams, of 2.50 mol of iron(II) hydroxide, Fe(OH)2?

If you have 644 grams of retinol (C20H30O), how many moles of retinol do you have?

A 42.7 gram sample of potassium nitrate (KNO_3) contains how many grams of potassium?

What is the mass, in grams, of 202 atoms of iron (Fe)? (1 mol of Fe has a mass of 55.85 g; Avogadro's number is 6.022 × 10^{23} atoms/mol.)

Which of the following best defines molar mass?