AP BIOLOGY

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BIOCHEMISTRY

PROPERTIES OF WATER

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
The atomic symbols of nitrogen and oxygen are N and O, respectively. The chemical formula of a particular substance is NO2. Which of the following is a correct description of the substance?
A
a compound made up of 2 nitrogen atoms and 2 oxygen atoms
B
a compound made up of 1 nitrogen atom and 2 oxygen atoms
C
an element made up of 2 nitrogen atoms and 2 oxygen atoms
D
an element made up of 1 nitrogen atom and 1 oxygen atom
Explanation: 

Detailed explanation-1: -Answer: The correct answer is option C. The given molecular formula of compound indicate its one molecule is made up of 1 nitrogen atom and 2 oxygen atoms.

Detailed explanation-2: -Dioxohydrazine | N2O2-PubChem.

Detailed explanation-3: -So, the molecular formula is N2O5.

Detailed explanation-4: -of nitrogen atoms=Mass in gramsAtomic wt. =2814=2No. of oxygen atoms=Mass in gramsAtomic wt. =8016=5∴ Formula of compound is N2O5.

Detailed explanation-5: -Nitric oxide (nitrogen oxide or nitrogen monoxide) is a colorless gas with the formula NO. It is one of the principal oxides of nitrogen. Nitric oxide is a free radical: it has an unpaired electron, which is sometimes denoted by a dot in its chemical formula (•N=O. or •NO).

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