The number of water molecules present in a dr | vedclass

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

Question

(A) Density of water at room temperature is $1 \ g/mL$. Mass of the drop $= 	ext{Density} 	imes 	ext{Volume} = 1 \ g/mL 	imes 0.0018 \ mL = 0.0018

Vedclass · Accepted Answer

$6.023 	imes 10^{19}$

Vedclass · Answer

(A) Density of water at room temperature is $1 \ g/mL$. Mass of the drop $= 	ext{Density} 	imes 	ext{Volume} = 1 \ g/mL 	imes 0.0018 \ mL = 0.0018 \ g$. Molar mass of water $(H_2O)$ $= 18 \ g/mol$. Number of moles $= \frac{	ext{Mass}}{	ext{Molar mass}} = \frac{0.0018 \ g}{18 \ g/mol} = 1 	imes 10^{-4} \ mol$. Number of water molecules $= 	ext{Number of moles} 	imes N_A = 1 	imes 10^{-4} 	imes 6.023 	imes 10^{23} = 6.023 	imes 10^{19}$.

The number of water molecules present in a drop of water (volume $0.0018 \ mL$) at room temperature is

Similar Questions

The number of gram atoms of oxygen present in $0.3 \ mol$ of $(COOH)_2 \cdot 2H_2O$ is

$1.4 \, mol$ of phosphorus trichloride $(PCl_{3})$ are present in a sample. How many atoms are there in the sample?

At $STP$,the moles of oxygen in $2.8 \ L$ of $CO_2$ gas is:

Choose the correct option for the mole fraction of both components in a gaseous mixture containing $7 \ g$ of nitrogen and $8 \ g$ of oxygen.

If $1 \, mL$ of water contains $20$ drops,then the number of molecules in $1$ drop of water is:

Vedclass Test Series

Exam Paper Generator

Online Exam Module