2. Atoms & Elements

What is the molar mass of sodium sulfate (Na2SO4)?

How many grams of krypton (Kr) are present in 2.50 moles of krypton?

Acetic acid has the chemical formula CH3COOH. How many grams of hydrogen (H) are present in 1.52 grams of acetic acid?

How many atoms are present in one formula unit of the compound FeC5O5?

What is the molar mass of calcium carbonate (CaCO_3)?

What is the molar mass of CH3CH2OH (ethanol)? Provide your answer to two decimal places.

How many moles of C_3H_8 are present in 67.8 grams of C_3H_8?

How many grams are present in 4.5 moles of sodium fluoride (NaF)?

What is the mass in grams of 1.900 × 10^{24} iodine atoms? (Atomic mass of iodine = 126.90 g/mol)

What is the molar mass of sodium chloride (NaCl)?

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?