Unit 7 EXAM: Stoichiometry

Quiz
•
Science
•
10th Grade
•
Medium
Miriam Cusack
Used 5+ times
FREE Resource
33 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 3 pts
What is the total number of atoms contained in a 1.00-mole sample of helium?
1.00 atom
2.00 atoms
1.20 × 10²⁴ atoms
6.02 × 10²³ atoms
2.
MULTIPLE CHOICE QUESTION
30 sec • 3 pts
A sample of a compound contains 65.4 grams of zinc, 12.0 grams of carbon, and 48.0 grams of oxygen. What is the mole ratio of zinc to carbon to oxygen in this compound?
1:4:6
5:1:4
1:1:2
1:1:3
3.
MULTIPLE CHOICE QUESTION
30 sec • 3 pts
What is the gram-formula mass of Fe(NO₃)₃?
146 g/mol
194 g/mol
214 g/mol
242 g/mol
4.
MULTIPLE CHOICE QUESTION
30 sec • 3 pts
The total number of moles represented by 20 grams of CaCO₃ is
1
2
0.1
0.2
5.
MULTIPLE CHOICE QUESTION
30 sec • 3 pts
Given the balanced equation: CaCO₃(s) + 2HCl(aq) → CaCl₂(aq) + H₂O(l) + CO₂(g), what is the total number of moles of CO₂ formed when 20. moles of HCl is completely consumed?
20. mol
40. mol
10. mol
5.0 mol
6.
MULTIPLE CHOICE QUESTION
30 sec • 3 pts
Given the formula representing a hydrocarbon: the molecular formula and the empirical formula for this hydrocarbon are
C₄H₈ and CH₃
C₅H₁₀ and CH₃
C₄H₈ and CH₂
C₅H₁₀ and CH₂
7.
MULTIPLE CHOICE QUESTION
30 sec • 3 pts
Which equation illustrates conservation of mass?
H₂ + O₂ → 2 H₂O
H₂ + Cl₂ → HCl
H₂ + O₂ → H₂O
H₂ + Cl₂ → 2 HCl
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