Embibe Experts Solutions for Chapter: Some Basic Concepts of Chemistry, Exercise 3: Level 3

When a mixture of $10$ mole of ${\mathrm{SO}}_2,15$ mole of ${\mathrm{O}}_2$ was passed over catalyst, $8$ mole of ${\mathrm{SO}}_3$ was formed. How many mole of ${\mathrm{SO}}_2$ and ${\mathrm{O}}_2$ did not enter into combination?

Silver metal reacts with nitric acid according to the equation $3\mathrm{Ag} \left(\mathrm{s}\right)+4{\mathrm{HNO}}_3 \left(\mathrm{aq}\right)⟶3{\mathrm{AgNO}}_3 \left(\mathrm{aq}\right)+\mathrm{NO} \left(\mathrm{g}\right)+2{\mathrm{H}}_2\mathrm{O} \left(\mathrm{aq}\right)$
The volume of $1.15 \mathrm{M} {\mathrm{HNO}}_3 \left(\mathrm{aq}\right)$ required to react with $0.784 \mathrm{g}$ of silver is:

${\mathrm{H}}_3{\mathrm{PO}}_4 \left(98 \mathrm{g} {\mathrm{mol}}^{-1}\right)$ is $98\%$ by mass of solution. If the density is $1.8 \mathrm{g}/\mathrm{ml}$, calculate the molarity.

What volume of $0.10 \mathrm{M} {\mathrm{H}}_2{\mathrm{SO}}_4$ must be added to $50 \mathrm{mL}$ of a $0.10 \mathrm{M}$ $\mathrm{NaOH}$ solution to make a solution in which the molarity of the ${\mathrm{H}}_2{\mathrm{SO}}_4$ is $0.05 \mathrm{M}$?

A sample of a mixture of ${\mathrm{CaCl}}_2$ and ${\mathrm{Na}}_2{\mathrm{CO}}_3$ weighing $4.22 \mathrm{g}$ was treated to precipitate all the $\mathrm{Ca}$ as ${\mathrm{CaCO}}_3.$ This ${\mathrm{CaCO}}_3$ is heated and quantitatively converted into $0.959 \mathrm{g}$ of $\mathrm{CaO}$. Calculate the percentage of ${\mathrm{CaCl}}_2$ in the mixture.  

(Atomic mass of $\mathrm{Ca}=40,\mathrm{O}=16,\mathrm{C}=12$ and $\mathrm{Cl}=35.5$)

If $0.5$ moles of ${\mathrm{BaCl}}_2$ is mixed with $0.2$ moles of ${\mathrm{Na}}_3{\mathrm{PO}}_4$, the maximum number of moles of ${\mathrm{Ba}}_3{\left({\mathrm{PO}}_4\right)}_2$ that can be formed is:

A mixture of two metals having the mass $2 \mathrm{gm} (\mathrm{A}=15,\mathrm{B}=30)$, are bivalent and dissolve in $\mathrm{HCl}$ and evolve $2.24 \mathrm{L} {\mathrm{H}}_2$at STP. What is the mass of $\mathrm{A}$ present in the mixture? 

The most abundant elements by mass in the body of a healthy human adult are: Oxygen $\left(61.4\%\right)$, Carbon $\left(22.9\%\right)$, Hydrogen $\left(10.0\%\right)$; and Nitrogen $\left(2.6\%\right)$. How much weight will a $75 \mathrm{kg}$ person gain if all $\mathrm{H}$ atoms are replaced by ${}_1{}^2\mathrm{H}$ atoms?