Mole Concept part 3

A formula with the lowest whole number ratio of elements in a compound is called …

• Chemical formula

• Structural formula

• Molecular formula

• Empirical formula

A chemical formula that shows the actual number of atoms present in one molecule of a compound is called …

• Chemical formula

• Structural formula

• Molecular formula

• Empirical formula

Which of the following is an empirical formula?

• P₄O₁₀

• N₂O

• C₂H₄

• H₂O₂

All of the following are empirical formulae EXCEPT

• C₃H₈

• Na₂SO₄

• N₂O₄

• Al₃(SO₄)₂

Which of the following is the correct empirical formula for C₄H₁₀?

• C₂H₅

• C₄H₁₀

• CH_2.5

• C₈H₂₀

A substance has a molecular formula of C₈H₁₀N₄O₂. The empirical formula is …

• C₂H₆N₂O

• CHNO

• C₄H₅N₂O

• C₉H₇N₃O

A compound is 25.9% nitrogen and 74.1% oxygen. Find its empirical formula.

• N₂O₄

• N₂O_5

• NO

• N₄O₆

Determine the empirical formula for a compound with 87.1% Ag and 12.9% S.

• Ag₃S₅

• AgS₂

• Ag₄S₂

• Ag₂S

Epinephrine (adrenaline) is a hormone secreted into the bloodstream in times of stress. It contains 59.0% C, 7.15% H, 26.20% O and 7.65% N and has a molar mass of 183 g mol-1. What is its molecular formula?

• C₅H₁₁N₃O₂

• C₈H₁₂NO₂

• C₇H₉N₂O

• C₉H₁₃NO₃

Molarity of a solution can be defined as …

• atomic mass of an element

• moles of solution per litre of solute

• moles of solute per litre of solution

• mass of solvent per litre of solution