2. Atoms & Elements

An alloy consists of 6 atomic percent Pb and 94 atomic percent Sn. What is the weight percent of Pb in the alloy? (Atomic masses: Pb = 207.2 g/mol, Sn = 118.7 g/mol)

Which of the following is the molar mass of molecular oxygen (O_2)?

Given the following gases: O_2, N_2, CO_2, and CH_4, which one has the largest molar mass?

What is the molar mass of H2CrO4?

What is the molar mass of ammonium sulfate, (NH_4)_2SO_4?

What is the molar mass of Cl (chlorine) in grams per mole?

What is the percent composition of sodium in sodium phosphate (Na_3PO_4)?

What is the mass of 0.25 mole of sodium (Na)?

Which of the following statements correctly describes molar mass?

What is the molar mass of (NH_4)_2SO_4?

Which of the following is the correct molar mass of sodium sulfate, Na2SO4?

What is the mass in grams of 36.70 moles of KBr?

Which of the following is the molar mass of water (H_2O)?

What is the molar mass of copper (Cu)?

If a sample of CO_2 contains 48 grams of oxygen, what is the mass of the CO_2 sample?