By mass percentage

Chemistry Level 3

Each of the following combinations of elemental mass percentages are supposed to represent a single compound. Which combination is impossible?

A: 40% C, 6.67% H, 53.33% O

B: 21.70% Na, 11.32% C, 66.98% O

C: 76.73% C, 12.34% H, 10.93% O

D: 9.62% Na, 43.51% Cr, 46.87% O

E: 10.22% N, 2.92% H, 40.15% Mn, 46.71% O

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