Sahana Ansari and Neha Miglani Solutions for Chapter: Some Basic Concepts of Chemistry, Exercise 4: Chapter Practice

Calculate the mass of a molecule of carbon dioxide (${}^{14}\mathrm{CO}_2$)?

Commercially available concentrated hydrochloric acid contains $38\% \mathrm{HCl}$ by mass.
What volume of concentrated hydrochloric acid is required to make $1.00 \mathrm{L}$ of $0.10 \mathrm{M} \mathrm{HCl}$? (Molarity = $12.38 \mathrm{M}$)

Calculate the percentage by mass of chromium in each of the following oxides.
$\mathrm{CrO}$

Calculate the percentage by mass of chromium in each of the following oxides.

${\mathrm{Cr}}_2{\mathrm{O}}_3$

Calculate the percentage by mass of chromium in each of the following oxides.

${\mathrm{CrO}}_3$

An element X forms four oxides having percentages of X equal to $77.4\%, 63.2\%, 69.6\%$ and $72.0\%$. Verify law of multiple proportions.
 

A solution of glucose in water is labelled as $10\% (\mathrm{w}/\mathrm{W})$. The density of the solution is $1.20 \mathrm{g} {\mathrm{mL}}^{-1}$. Calculate molarity.

A solution of glucose in water is labelled as $10\% (\mathrm{w}/\mathrm{W})$. The density of the solution is $1.20 \mathrm{g} {\mathrm{mL}}^{-1}$. Calculate molality.