What is the fraction of the mass of water due | vedclass

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

Question

(C) The molar mass of water $(H_2O)$ is $18 \, g/mol$.The mass of one molecule of water is $\frac{18}{N_A} \, g$,where $N_A$ is the Avogadro number.In

Vedclass · Accepted Answer

$\frac{8}{18}$

Vedclass · Answer

(C) The molar mass of water $(H_2O)$ is $18 \, g/mol$.The mass of one molecule of water is $\frac{18}{N_A} \, g$,where $N_A$ is the Avogadro number.In one molecule of water $(H_2O)$,there are $2$ hydrogen atoms and $1$ oxygen atom.Hydrogen $(^1H)$ has $0$ neutrons,while Oxygen $(^{16}O)$ has $8$ neutrons.Therefore,the total number of neutrons in one molecule of water is $8$.The mass of $8$ neutrons is $\frac{8}{N_A} \, g$.The fraction of the mass of water due to neutrons is calculated as: $\frac{	ext{Mass of neutrons}}{	ext{Total mass of water}} = \frac{8/N_A}{18/N_A} = \frac{8}{18}$.

What is the fraction of the mass of water due to neutrons?

Similar Questions

Which of the following will have maximum mass?

Calculate the number of atoms in $0.02$ mole of carbon.

The mass of one steel screw is $4.11 \, g$. Find the mass of one mole of these steel screws. Compare this value with the mass of the Earth $(5.98 \times 10^{24} \, kg)$. Which one of the two is heavier and by how many times?

What is meant by the following?
$(i)$ Molar mass
$(ii)$ Valency

Nitrogen and hydrogen combine in the ratio $14:3$ by mass to form an ammonia molecule. Find the formula of the ammonia molecule by calculating the molar ratio. (Given atomic mass of $N = 14 \ u, H = 1 \ u$)

Vedclass Test Series

Exam Paper Generator

Online Exam Module