Options for full question:
(A) % oxygen is 32.1%
(B) % hydrogen is 4%
(C) total percent composition of all elements is approximately 100%
(D) % carbon is 15.9%
Answer:
Options B and C
Explanation:
Information Given;
Mass of sample - 50g
Mass of Oxygen - 32.1g
Mass of Hydrogen - 2g
Mass of Carbon - 15.9g
The percentage composition of an element in a compound is the mass percentage of the element present in the compound. It tells the mass percentage of each element present in a compound.
The formular is given as;
Percentage composition = (Mass of element / Mass of compound) * 100
For oxygen;
Percentage Composition = (32.1 / 50) * 100 = 0.642 * 100= 64.2%
For Hydrogen;
Percentage Composition = (2 / 50) * 100 = 0.04 * 100= 4%
For Carbon;
Percentage Composition = (15.9 / 50) * 100 = 0.318 * 100= 31.8%
Total percentage composition of all elements = 4% + 31.8% + 64.2% = 100%
Based on this,
Option A is incorrect
Option B is Correct.
Option C is Correct.
Option D is incorrrect
