Question

Quantitatively, formula represents:
(This question has multiple correct options)
A.One molecule of the substance
B.The actual number of atoms of each element in one molecule of the substance.
C.The number of parts by weight of the substance (molecular weight)
D.The number of parts by weight of each element.

Answer 1

We must know that the quantitative data or information is obtained, based on the quantities on a measurement process. Quantitative is used in many fields such as, statistics (quantitative analysis), quantification (science fields), numerical data (quantitative data), quantitative properties (in scientific investigation), etc.

Complete step by step answer:
We have to remember that quantitative, it is also important in chemistry when we know to calculate the formula, sample analysis, etc.
Let us see the options one by one to seek out the correct option.
Option A. One molecule of the substance
For example: $C{H_3}OH$ , $KCl$ , etc.
Each mole of potassium chloride contains one mole of potassium atom and one mole of chloride atom.
Now we discuss option B as the actual number of atoms of each element in one molecule of the substance.
For example: $C{H_3}OH$.
The above shows methanol contains one carbon, four hydrogens, and one oxygen.
Let’s us see the option C as, the number of parts by weight of the substance (molecular weight)
The molecular weight of the substance is determined by,
For example:
${H_2}O$
As we know,
Mass of hydrogen=1
No. of hydrogen atoms in water molecule=2
Mass of oxygen=16
No. of oxygen atom in water molecule=1
$\left( {{\text{Mass of hydrogen + How many atoms of hydrogen}}} \right) + \left( {{\text{Mass of oxygen + How many atoms of oxygen}}} \right)$Now we can substitute the known values we get,
$(1 + 2) + (16 + 1) = 18g/mol$
The substance mole is calculated by one mole of that particular substance and it is given by grams.
Now we can see the option D as,
It is explained by given example,
$H{}_2O$ Molecular mass is $18g/mol$
Each mole of water contains two moles of hydrogen atoms and one mole of oxygen atom.
Percentage of hydrogen in water molecule is,
$\dfrac{2}{{18}} \times 100 = 11.11\%$
Percentage of oxygen in water molecule is,
$\dfrac{{16}}{{18}} \times 100 = 88.89\%$
From the above discussions, we can conclude thus the option A, B. C, D are correct.

Note:
We need to know that in contrast with quantitative, qualitative means, records qualities that are not-quantifiable information, subjective, descriptive or difficult to measure. We need to remember that an example of quantitative analysis is the gravimetric method. In this method we can quantitatively determine the analyte by using the mass whereas qualitative analysis in the chemistry shows what is in the sample.