Embibe Experts Solutions for Chapter: Some Basic Concepts of Chemistry, Exercise 2: Level 2

Which one has the highest percentage of nitrogen?

In a certain operation, $358 \mathrm{g}$ of ${\mathrm{TiCl}}_4$ is reacted with $96 \mathrm{g}$ of $\mathrm{Mg}$. Calculate $\%$of yield of $\mathrm{Ti}$ if $32 \mathrm{g}$ of $\mathrm{Ti}$ is actually obtained [At. wt. $\mathrm{Ti} =48, \mathrm{Mg}=24$]

How much ${\mathrm{NaNO}}_3$ must be weighed out to make $50 \mathrm{ml}$ of an aqueous solution containing $70 \mathrm{mg}$ of ${\mathrm{Na}}^{+}$ per $\mathrm{mL}$?

The copper metal reacts with Nitric acid based on the reaction

$3\mathrm{Cu}\left(\mathrm{s}\right)+8{\mathrm{HNO}}_3\left(\mathrm{aq}\right)⟶3\mathrm{Cu}{\left({\mathrm{NO}}_3\right)}_2\left(\mathrm{aq}\right)+2\mathrm{NO}\left(\mathrm{g}\right)+4{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)$

If $18.75 \mathrm{g} \mathrm{Cu}{\left({\mathrm{NO}}_3\right)}_2$ is eventually obtained, then how many grams of Nitric oxide ($\mathrm{NO}$) would have also formed, according to the given equation?

$1.12 \mathrm{mL}$ of gas is produced at $\mathrm{STP}$ by the action of $4.12 \mathrm{mg}$ of alcohol $\mathrm{ROH}$ with methyl magnesium iodide. The molecular mass of alcohol $\left(\mathrm{in} \mathrm{g}/\mathrm{mol}\right)$ is:

One litre of an acidified solution of ${\mathrm{KMnO}}_4$ containing $15.8 \mathrm{g}$ of ${\mathrm{KMnO}}_4$ is decolourised by passing a sufficient amount of ${\mathrm{SO}}_2$. If ${\mathrm{SO}}_2$ is produced by roasting of iron pyrites $\left({\mathrm{FeS}}_2\right)$, what will be the amount of pyrites (in grams) required to produce the necessary amount of ${\mathrm{SO}}_2$?

(Atomic mass of $\mathrm{K}=39, \mathrm{Mn}=55, \mathrm{S}=32, \mathrm{O}=16, \mathrm{Fe}=56, \mathrm{H}=1$)

Round off your answer to the nearest integer.

An alloy of aluminium and copper was treated with aqueous $\mathrm{HCl}$. The aluminium dissolved according to the reaction $\mathrm{Al}+3{\mathrm{H}}^{+}\to {\mathrm{Al}}^{3+}+\frac{3}{2}{\mathrm{H}}_2$, but the copper remained as a pure metal. A $0.350 \mathrm{g}$ sample of the alloy gave $415 \mathrm{cc}$ of ${\mathrm{H}}_2$ measured at $273 \mathrm{K}$ and $1 \mathrm{atm}$ pressure. What is the weight percentage of $\mathrm{Al}$ in the alloy?

Give the final answer up to first place of decimal after rounding off.

The natural titanium oxide, known as rutile and containing $39.95\%$ of oxygen, is isomorphous with ${\mathrm{SnO}}_2,$ known as cassiterite. Calculate the atomic weight of titanium.

Give the answer up to first place of decimal.