2. Atoms & Elements

How many grams are in 0.16 moles of sodium carbonate (Na2CO3)?

What is the oxygen-to-hydrogen mass ratio in hydrogen peroxide (H2O2)?

What is the molar mass of ammonia (NH_3)?

Given a 0.300 M solution of HF, what concentration of NaF is required to achieve [H3O+] = 2.3 × 10^{-4} M? (Assume Ka for HF = 7.2 × 10^{-4} and that NaF fully dissociates.)

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

What is the mass of sodium (Na) in grams present in 7.5 grams of sodium benzoate (NaC7H5O2)?

Which quantity is equivalent to 39 grams of LiF?

What is the molar mass of sucrose (C12H22O11) in grams per mole?

The atomic mass of argon is 39.948 amu. Without any mathematical computations, which of the following isotopes has the largest natural abundance?

Exact Mass 3 Isotopes of Argon

Isotope	Isotopic Mass
36Ar	35.96755 amu
38Ar	37.96272 amu
40Ar	39.96238 amu

Which of the following is the correct molar mass (to two decimal places) of silver nitrate, AgNO_3?

What is the mass of one mole of carbon atoms?

What is the mass of 7.00 mol of hydrogen peroxide (H_2O_2)?

Benzene has the chemical formula C_6H_6. If you have 24.0 grams of benzene, how many grams of hydrogen are present in this sample?

What is the mass of 4.32 mol of GaI_3?