Embibe Experts Solutions for Chapter: Atoms And Molecules, Exercise 1: Exercise

What do you mean by a molecule?

Between density of vapour and relative density which is dependent on temperature and why?

Why dry air is heavier than wet air but dry hydrogen is lighter than wet air?

Density of a gaseous element is $5$ times that of oxygen gas under the same condition. If the elemental gas molecule is diatomic, what will be its relative atomic mass?

Find the percentage of nitrogen in ammonia. 

Calculate the $\%$ of each element in calcium carbonate. (Atomic mass: $\mathrm{C}-12\mathrm{u}, \mathrm{O}-16\mathrm{u}, \mathrm{Ca} -40\mathrm{u}$). 

Calculate the $\%$ of oxygen in ${\mathrm{Al}}_2({\mathrm{SO}}_4{)}_3$.(Atomic mass: $\mathrm{Al}-27\mathrm{u}, \mathrm{O}-16\mathrm{u}, \mathrm{S} -32\mathrm{u}$). 
 

Calculate the $\%$ relative abundance of $\mathrm{B}-10$ and $\mathrm{B}-11$, if its average atomic mass is $10.804 \mathrm{amu}$.