Question detail
Calculate the percentage by mass of oxygen in carbon dioxide (CO2).
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
Type
exam_style
Style
Topic
Chemical measurements, conservation of mass and the quantitative interpretation of chemical equations
Question
Calculate the percentage by mass of oxygen in carbon dioxide (CO2).
Answer
The percentage by mass of oxygen in carbon dioxide is 72.7%.
Explanation
This question assesses the understanding of how to calculate the percentage composition of an element in a compound using relative formula mass. It requires knowledge of both the formula and the relative atomic masses.
Common mistake
Confusing Relative Atomic Mass with Relative Formula Mass
Students often confuse relative atomic mass (Ar) with relative formula mass (Mr), thinking they are the same.
Remember that relative atomic mass refers to a single atom, while relative formula mass is the sum of the relative atomic masses of all atoms in a formula.
Related flashcards
Flashcard 1 of 5
Related practice questions
Question 1 of 5
Choose an answer, get feedback, then move sideways through the set.