- Describe the particles of argon in 79.8 grams of elemental argon by both
number and type.
(A) 2 mol of argon atoms
(B) 2 mol of argon molecules
(C) 6.02 × 10^23 argon molecules
(D) 6.02 × 10^23 argon atoms
- A sample of oxygen gas with a volume of 11.2 L at STP would contain
how many particles of that gas?
(A) 6.02 × 10^23 molecules
(B) 3.01 × 10^23 molecules
(C) 1.12 × 10^23 atoms
(D) 3.01 × 10^23 atoms
- The density of gases in g/L
(A) is independent of the identity of the gas
(B) can be found by dividing its molar mass by 22.4 as long as it’s at
STP
(C) can be found by multiplying its molar mass by 22.4 as long as it’s at
STP
(D) can be found by dividing its molar mass by 22.4 as long as it’s not
at STP
- In the reaction between magnesium and oxygen to produce magnesium
oxide, the number of moles of oxygen needed to react with 4 moles of
magnesium is
(A) 1 mole
(B) 2 moles
(C) 3 moles
(D) 4 moles
- In the reaction
H 2 (g) + Cl 2 (g) → 2HCl(g)
what volume of HCl could be produced when 3 L of H 2 reacts with 2 L
of Cl 2?
(A) 2 L
(B) 3 L
(C) 4 L
(D) 5 L
