Question

How many moles of sodium chloride are present in a sample that has a mass of $1.17g$ ?
A. $0.005mol$
B. $0.01mol$
C. $0.02mol$
D. $0.03mol$

Answer 1

We need to remember that one mole of any component or synthetic compound is consistently a similar number. One mole of hydrogen would mean there are $6.022 \times {10^{23}}$ atoms of hydrogen. Molarity is likewise viewed as molar focus since it is the proportion of a centralization of a solution. Molarity is the quantity of moles of solute per liter of arrangement.
${\text{Number of moles}} = \dfrac{{{\text{Mass of substance}}}}{{{\text{Mass of one mole}}}}$

Complete step by step answer:
Given,
It is given that the mass of sodium chloride is $1.17g$ .
We know that the atomic weight of sodium is $23g/mol$ .
The atomic mass of chloride is $35.5g/mol$ .
Now we can calculate the molar mass of sodium chloride,
The molar mass of sodium chloride $= 23 + 35.5 = 58.5g$
Now, we can calculate the number of moles as follows,
$Moles{\text{ = }}\dfrac{{{\text{Mass of NaCl}}}}{{{\text{Molar mass of NaCl}}}} = \dfrac{{1.17}}{{58.5}}$
On simplification we get,
$= 0.02moles$
The moles of sodium chloride present in a given sample is 0.02mol.

So, the correct answer is Option C.

Note: Now we can discuss about the nature of sodium chloride,
As we know that the sodium chloride ordinarily known as salt. It is an ionic compound with the synthetic equation $NaCl$ , speaking to a $1:1$ proportion of sodium and chloride particles. With molar masses of $22.99$ and $35.45{\text{ }}g/mol$ individually, $100g$ of $NaCl$ contains $39.34gNa$ and $60.66gCl$. Sodium chloride is the salt generally liable for the saltiness of seawater and of the extracellular liquid of numerous multicellular creatures. In its consumable type of table salt, it is usually utilized as a fixing and food additive. Enormous amounts of sodium chloride are utilized in numerous modern cycles, and it is a significant wellspring of sodium and chlorine aggravates utilized as feedstocks for additional substance unions. A second significant use of sodium chloride is de-icing of streets in sub-frigid climates.