2. Atoms & Elements

How many atoms of oxygen are present in 4875 milligrams of Ca3(PO4)2?

What is the mass of 1.20 × 10^{24} atoms of potassium (K)? (Atomic mass of K = 39.1 g/mol)

What is the mass in grams of 2.57 × 10^{23} molecules of I_2?

What is the molar mass of NaCl?

What is the molar mass (formula weight) of magnesium nitrate, Mg(NO3)2?

What is the molar mass of ammonia (NH_3)?

Approximately how much does one mole of carbon atoms (each having an atomic weight of 12) weigh?

How many grams are present in a 2.7 mol sample of CO_2?

What is the mass of 1.000 mole of carbon atoms?

What is the molar mass of sodium (Na)?

What is the molar mass of pure tin (Sn)?

What is the molar mass (formula weight) of Ca(NO3)2? Provide your answer to two decimal places.

How many carbon atoms are present in 15.0 grams of graphite (pure carbon)? (Atomic mass of carbon = 12.01 g/mol)

Which of the following is the molar mass of 1 mol of carbon (C)?

What is the molar mass of hydrochloric acid (HCl)?