What is the actual mass of a water molecule?

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(B) The molar mass of water $(H_2O)$ is $18 \ g/mol$.According to the mole concept,$1 \ mol$ of water contains $N_A$ (Avogadro's number,$6.022 	imes

Vedclass · Accepted Answer

$2.99 	imes 10^{-23} \ g$

Vedclass · Answer

(B) The molar mass of water $(H_2O)$ is $18 \ g/mol$.According to the mole concept,$1 \ mol$ of water contains $N_A$ (Avogadro's number,$6.022 	imes 10^{23}$) molecules.Therefore,the mass of $N_A$ molecules of water is $18 \ g$.The mass of $1$ molecule of water is calculated as $\frac{18}{N_A} \ g$.Substituting $N_A = 6.022 	imes 10^{23}$,we get $\frac{18}{6.022 	imes 10^{23}} \approx 2.99 	imes 10^{-23} \ g$.

Similar Questions

The number of molecules and atoms present in $7.1 \ g$ of chlorine gas $(Cl_2)$ are respectively:

Calculate the number of molecules present in $2.24 \text{ dm}^3$ of carbon dioxide $(CO_2)$ at $STP$.

What is the mass of $1$ mole of electrons?

$0.1$ mole of compound $'S'$ will weigh $.......... \ g$.
(Given molar mass in $g \ mol^{-1} \ C: 12, H: 1, O: 16$)

If $N_A$ is Avogadro’s number,then the number of valence electrons in $4.2 \ g$ of nitride ions $(N^{3 -})$ is ................... $N_A$.

Vedclass Test Series

Exam Paper Generator

Online Exam Module