What is the percent by mass of oxygen in CH3COOH (gram-formula mass = 60. g/mol)?
- Mayya Alocci
- Jun 13
- 1 min read
Regents Chemistry Exam January 2025 Question 35
36 What is the percent by mass of oxygen in CH3COOH (gram-formula mass = 60. g/mol)?
(1) 27% (3) 53%
(2) 32% (4) 60.%
Solution:
Percent by mass formula can be found in Table T on the Reference Table. % composition is equal to the mass of part/mass of whole 100%. There are two oxygen atoms in the formula, each one has a mass of 15.9994. We get (15.9994*2/ 60 )*100% = 53%, choice 3.
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