Percentage Composition of Compounds

There are two common oxides of Sulphur, one of which contains $50\% {\mathrm{O}}_2$by weight, the other almost exactly $60\%$. The weights of Sulphur which combine with $1 \mathrm{g}$ of ${\mathrm{O}}_2$ (fixed) are in the ratio of:

What is the mass percentage of carbon in carbon monoxide?

$0.12 \mathrm{g}$ of an organic compound '$\mathrm{X}$' containing phosphorus, on reacting with magnesia mixture gave $0.22 \mathrm{g}$ of magnesium pyro-phosphate $\left({\mathrm{Mg}}_2{\mathrm{P}}_2{\mathrm{O}}_7\right)$. The percentage of phosphorus in the compound '$\mathrm{X}$' is:

Calculate the weight of copper present in $50\mathrm{ }\mathrm{g}$ of $\mathrm{C}\mathrm{u}\mathrm{S}{\mathrm{O}}_4$.

In the compound ${\text{CaCO}}_3·3{\text{Ca}}_3{\left({\text{PO}}_4\right)}_2$ , What percentage of oxygen is present ?

Which of the following pair have the same percentage of carbon in them?

What is the amount of ${\mathrm{H}}_2{\mathrm{O}}_2$ required to give $252\mathrm{g}$ of ${\mathrm{HNO}}_3$, provided the impurity of ${\mathrm{H}}_2{\mathrm{O}}_2$ is $20\%?$

${\mathrm{N}}_2{\mathrm{H}}_4+{\mathrm{H}}_2{\mathrm{O}}_2\to {\mathrm{HNO}}_3+{\mathrm{H}}_2\mathrm{O}$

$30 \mathrm{g}$ alloy of $\mathrm{Al}$ and $\mathrm{Mg}$ when heated with excess of dil. $\mathrm{HCl}$forms ${\mathrm{AlCl}}_3$ and ${\mathrm{MgCl}}_2$ respectively. If the volume of ${\mathrm{H}}_2\left(\mathrm{g}\right)$ released at NTP is $33.6 \mathrm{L}$, then what is the composition of the alloy?

Calculate the molar mass of myoglobin based on information given below:
Myoglobin $\left(\mathrm{Mb}\right)$, an oxygen storage protein, contains $0.34\%$ $\mathrm{Fe}$ by mass, and in each molecule of myoglobin, one ion of $\mathrm{Fe}$ is present. (Molar mass of $\mathrm{Fe}=55.845 \mathrm{g} {\mathrm{mol}}^{-1}$)

Mark the correct empirical formula of the compound. The following analysis was given and observed.

1. $0.45 \mathrm{g}$ of an organic compound gave on combustion, $0.792 \mathrm{g}$ of ${\mathrm{CO}}_2$ and $0.324 \mathrm{g}$ of water.
2. $0.24 \mathrm{g}$ of the same substance was Kjeldahlised and the ammonia liberated was absorbed in $50 \mathrm{mL}$ of $\mathrm{M}/8 {\mathrm{H}}_2{\mathrm{SO}}_4$.
3. The excess acid required is $77 \mathrm{mL}$ of $\mathrm{N}/10 \mathrm{NaOH}$ for complete neutralisation.

$0.53 \mathrm{g}$ of an organic compound gave $1.158 \mathrm{g}$ of $\mathrm{B}\mathrm{a}\mathrm{S}{\mathrm{O}}_4$ on analysis. Calculate the $\% \mathrm{of} \mathrm{S}$ in the compound.

Calculate the number of magnesium atoms present in $2 \mathrm{g}$ of Chlorophyll, a green colouring matter of plants responsible for photosynthesis, containing $2.68\mathrm{\%}$ of magnesium by mass.

Chlorophyll is responsible for photosynthesis, that contains $2.68\mathrm{\%}$ of magnesium. Calculate the number of magnesium atoms present in $2.00 \mathrm{g}$ of chlorophyll.

Quantitative estimation of $\mathrm{C}$, $\mathrm{H}$, and extra elements (e.g., $\mathrm{N}$, $\mathrm{S}$, $\mathrm{P}$, and halogens) is carried out by Liebig’s combustion , Caro's, Dumas, and Kjeldahl’s method.

In the quantitative estimation of oxygen by using ${\mathrm{I}}_2{\mathrm{O}}_5$. 

Where $\mathrm{W}$ is the mass ${\mathrm{CO}}_2$ and $\mathrm{w}$ is the mass of the compound.

Quantitative estimation of $\mathrm{C}$, $\mathrm{H}$, and extra elements (e.g., $\mathrm{N}$, $\mathrm{S}$, $\mathrm{P}$, and halogens) is carried out by Liebig’s combustion , Caro's, Dumas, and Kjeldahl’s method.

In the quantitative estimation of phosphorous by using ammonium molybdate, which of the following is formula used?

(Where $\mathrm{W}$ is the mass of ammonium phospho molybdate and $\mathrm{w}$ is the mass of the compound)

A compound contains 28% ${\mathrm{N}}_2$ and 72% of a metal by weight. 3 atoms of the metal combines with 2 atoms of N. The atomic weight of metal is

0.50 g sample of impure $\mathrm{C}\mathrm{a}\mathrm{C}{\mathrm{O}}_3$ is dissolved in 50 ml of 0.0985 (N) HCl. After the reaction is complete, the excess HCl required 6 ml of 0.105 N NaOH for neutralisation. The percentage purity of $\mathrm{C}\mathrm{a}\mathrm{C}{\mathrm{O}}_3$ in the sample is

0.73 g of organic compound on oxidation gave 1.32 g of carbon dioxide. The percentage of carbon in the given compound will be