Which of the following represents a compound? C20 H2O O2 H2
2 answers:
Answer: Option (b) is the correct answer.
Explanation:
A compound is defined as a substance that has two or more number of different atoms which are chemically combined to each other in a fixed ratio by mass.
For example, contains two atoms of hydrogen and one atom of oxygen which are chemically combined together in 2:1 ratio. Therefore, it is a compound.
On the other hand, if a substance contains only atoms of one type of element then it is known as a molecule.
For example, ,
, and
are all molecules.
Thus, we can conclude that out of the given options represents a compound.
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Answer:
116.1 a.m.u.
It is not likely that RCOOH is the pentanoic acid
Explanation:
Let's consider the generic neutralization between NaOH and a monoprotic carboxylic acid.
RCOOH(aq) + NaOH(aq) ⇒ RCOONa(aq) + H₂O(l)
The molar ratio of RCOOH to NaOH is 1:1. The moles of RCOOH are:
The molar mass of RCOOH is:
Thus, the molecular weight is 116.1 a.m.u.
Pentanoic acid has the formula C₅H₁₀O₂ with a molecular weight of 102.1 a.m.u. So, it is not likely that RCOOH is the pentanoic acid.