Tamil Nadu Board Solutions for Chapter: Atoms and Molecules, Exercise 5: TEXTBOOK EVALUATION

${\mathrm{N}}_2+3{\mathrm{H}}_2\to 2{\mathrm{NH}}_3$

(The atomic mass of nitrogen is $14$, and that of hydrogen is $1$) 

$1$ mole of nitrogen (_____ $\mathrm{g}$) + $3$ moles of hydrogen (_____ $\mathrm{g}$)$\to$ $2$ moles of ammonia (_____ $\mathrm{g}$)

How many grams are there in the following? 

$2$ moles of hydrogen molecule, ${\mathrm{H}}_2$.

How many grams are there in the following? 

$3$ moles of chlorine molecule, ${\mathrm{Cl}}_2$.

How many grams are there in the following? 

$5$ moles of sulphur molecule, ${\mathrm{S}}_8$.

How many grams are there in the following? 

$4$ moles of phosphorous molecule, ${\mathrm{P}}_4$.

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 $10.804 \mathrm{amu}$.