2. Atoms & Elements

Given that the molar mass of NH_3 is 17.03 g/mol, how many moles of NH_3 are present in a 107.1 g sample?

What is the molar mass of KBr?

If 71.89 g of CO_2 is decomposed, what mass of oxygen (O_2) is produced? (Use the periodic table to find molar masses.)

How many total atoms of hydrogen are present in one formula unit of the compound 2H2O2?

Given that 5.38 × 10^{16} molecules of 1-butene have a mass of 5.00 μg, what is the molar mass of 1-butene?

What is the molar mass of butane, C_4H_{10}?

Given a graph showing the rates of effusion for four different gases—He, N2, O2, and CO2—which gas has the smallest molar mass?

What is the molar mass of SO_2?

Which of the following is the molar mass of acetic acid (CH3COOH)?

What is the mass of 0.369 moles of Mg(NO3)2 (molar mass = 148.3 g/mol)?

Which of the following compounds has the smallest molar mass?

What is the mass in grams of 1.02 × 10^{24} atoms of manganese (Mn)? (Atomic mass of Mn = 54.94 g/mol)

Which of the following numerical expressions gives the number of moles in 5.0 g of CaO?

A sample of CH2F2 with a mass of 19 g contains how many atoms of F?

A gas has a density of 3.55 g/L at 2.00 atm and 55.0 °C. What is the molar mass of the gas?