A sample is prepared by adding 10 grams of oxygen gas to 10 grams of nitrogen gas. No energy change is observed. which best describes sample
A )a mixture that is 50% oxygen by Mass
B) a compound that is 50% oxygen by Mass
C) a mixture in which 50% of the atoms are oxygen
D) a compound in which 50% of the atoms are oxygen

B) a compound that is 50% oxygen by Mass.

Explanation:

No energy change is observed.

what are the choices?

8

explanation:

each principal energy level above the first contains one s orbital and three p orbitals. a set of three p orbitals, called the p sublevel, can hold a maximum of six electrons. therefore, the second level can contain a maximum of eight electrons - that is, two in the s orbital and 6 in the three p orbitals.

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