2. Atoms & Elements

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?

What is the molar mass of methanol (CH3OH)?

If 0.250 mol of Cu is produced in a reaction, and the molar mass of Cu is 63.55 g/mol, how many grams of Cu are produced?

What is the molar mass of C2H4O2 (acetic acid)?

A sample contains magnesium hydroxide. What is the molar mass of Mg(OH)_2?

What is the mass, in grams, of 1.5 moles of CO_2?

What is the mass, in grams, of a 2.16-mol sample of HNO3?