Chemical Composition Exam

Which of the following elements is not a diatomic molecule?

• nitrogen

• helium

• hydrogen

• oxygen

Which of the following is not an empirical formula?

• BeCr₂O₇

• C₃H₈O

• Sb₂S₃

• C₂N₂H₈

Which combination of temperature and pressure correctly describes standard temperature and pressure, STP?

• 1^oC and 0 atm

• 0^oC and 1 atm

• 0^oC and 22.4 kPa

• 100^oC and 100 atm

The lowest whole-number ratio of the elements in a compound is called the ____.

• binary formula

• molecular formula

• empirical formula

• representative formula

The volume of one mole of a substance is 22.4 L at STP for all ____.

• liquids

• solids

• compounds

• gases

Avogadro's number of representative particles is equal to one ____.

• mole

• kilogram

• kelvin

• gram

At STP, one mole of any gas occupies

• 1 L

• 22.4 L

• 6.02 x 10²³ L

• none of the above

Which of the following compounds have the same empirical formula?

• C₄H₁₀ and C₁₀H₄

• C₇H₁₄ and C₁₀H₂₀

• CO₂ and SO₂

• C₆H₁₂ and C₆H₁₄

What is the SI unit is used to measure the number of representative particles in a substance?

• kelvin

• mole

• ampere

• kilogram

What is the molar mass of AuCl₃?

• 232.52 g

• 130.05 g

• 303.32 g

• 96.00 g