Writing Chemical Formulae

An organic compound A contains $69.77\%$ carbon, $11.63\%$ hydrogen and the rest is oxygen. The molecular mass of the compound is $86$. It does not reduce Tollen’s reagent but forms an addition product with sodium hydrogen sulphite and gives positive iodoform test. On vigorous oxidation it gives ethanoic and propanoic acids. The compound A is:

An organic compound contains carbon, hydrogen and oxygen. Its elemental analysis gave $\mathrm{C}, 38.71\%$ and $\mathrm{H}, 9.67\%$. The empirical formula of the compound would be:

Empirical formula of a compound is ${\mathrm{C}}_2{\mathrm{H}}_4\mathrm{O}$. If its empirical formula weight is equal to its vapour density. Calculate the molecular formula of the compound.

Calculate the empirical and molecular formula of a compound whose molecular weight is $120$ and has the following percentage compositions: $\mathrm{Mg} = 19.68\%; \mathrm{S} = 26.24\%, \mathrm{O} = 52.48\%$ 

Calculate the empirical and molecular formula of an organic compound whose percentage composition is $\mathrm{C} = 70.54\%, \mathrm{H} = 5.87\%, \mathrm{O} = 23.52\%$. The molecular weight of compound is $136$. 

If the formula of a metallic nitrate is $\mathrm{M}{\left({\mathrm{NO}}_3\right)}_2$, then what will be the formula of the nitride of that metal?

A gaseous hydrocarbon of vapour density $14$ contains $85.2\%$ of carbon. Calculate its molecular formula. 

A metal `$\mathrm{M}$' forms a compound with a non-metal with atomic number $8$ and the ratio of non-metal to total number of atoms is $1 : 3$. Derive the formulae of the following compounds of the succeeding element of $\mathrm{M}$. (A) Hydrogen phosphate (B) Bicarbonate (C) Silicate (D) Nitride 

Identify the correct sequence of relevant steps to write the formula of cupric bisulphate.

$\left(1\right)$ Writing the symbol of a negative radical as ${{\mathrm{HSO}}_4}^{2-}$.

$\left(2\right)$ Writing the symbol of a positive radical as ${\mathrm{Cu}}^{2+}$.

$\left(3\right)$ Writing the symbol of a negative radical as ${{\mathrm{HSO}}_4}^{-}$.

$\left(4\right)$ Writing the symbol of a positive radical as ${\mathrm{Cu}}^{+}$.

$\left(5\right)$ Interchanging the valencies of positive and negative radicals and writing subscripts as $1$ and $2$.

$\left(6\right)$ Interchanging the valencies of positive and negative radicals and writing subscripts as $2$ and $1$.

$\left(7\right)$ Keeping ${\mathrm{HSO}}_4$ in parenthesis.

$\left(8\right)$ Keeping $\mathrm{Cu}$ in parenthesis.

Write the formulae of plumic chloride.

Write the formulae of cuprous oxide.

Give the name of the following compound and derive the formula by using criss-cross method.

${\mathrm{Na}}^{+} {\mathrm{HSO}}_4^{-}$

Give the name of the following compound and derive the formula by using criss-cross method.

${\mathrm{NH}}_4^{+} {\mathrm{P}}^{3-}$