Percent composition tells you which types of atoms (elements) are present in a molecule and their levels. Percent composition can also tell you about the different elements present in an ionic compound as well.
Let's look at two examples
The molar mass of #H_2O# is 18 g/mol The hydrogens make up 2g (since each mole of hydrogen is 1g)
The oxygen makes up 16g.
Class-11-science»Chemistry
Some Basic Concepts of Chemistry
Dear Student, mass of C present in compound = 6g mass of H present in compound = 1g total mass = 7g % composition of C = 6/7 = 85.7% = 86% % composition of H = 1/7 = 14.2%= 14%
(A) is correct
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