ABEKA Chemistry Precision & Design Grade 11 - Test 2 Exam with Verified Detailed Answers.docx

ABEKA Chemistry: Precision &
Design Grade 11 - Test 2 Exam with
Verified Detailed Answers
What is the value of Avogadro's number?
a. 1.602 x 10⁻²³
b. 6.022 x 10⁻²³
c. 1.602 x 10²³
d. 6.022 x 10²³ -
correct answer ✅d. 6.022 x 10²³


A molecule of sugar fructose contains 6 carbon atoms, 12 hydrogen
atoms, and 6 oxygen atoms. What is it empirical formula?
a. CHO
b. CHO₂₄
c. CH₂O
d. C₆H₁₂O₆ -
correct answer ✅c. CH₂O


Which of the following mole ratios cannot be derived from the
equation 2 C₇H₈(g)→7 CO₂(g) + 4 H₂O(g)?
a. 4 mol C₇H₈ : 2 mol H₂O
b. 9 mol O₂ : 7 mol CO₂

, ABEKA Chemistry: Precision &
Design Grade 11 - Test 2 Exam with
Verified Detailed Answers
c. 2 mol C₇H₈ : 9 mol O₂
d. 2 mol C₇H₈ : 7 mol CO₂ -
correct answer ✅a. 4 mol C₇H₈ : 2 mol H₂O


If the empirical formula of a substance is known, what additional
information is needed to calculate the molecular formula?
a. molar mass
b. limiting amount
c. stoichiometric coefficient
d. displacement factor -
correct answer ✅a. molar mass


What is the formula of nitrogen dioxide?
a. NO
b. NO₂
c. N₂O
d. N₂O₂ -
correct answer ✅b. NO₂