Percentage Composition of Compounds

$0.765 \mathrm{g}$ of an acid gives $0.535 \mathrm{g}$ of ${\mathrm{CO}}_2$ and $0.13 \mathrm{g}$ of ${\mathrm{H}}_2\mathrm{O}$ then ratio of percentage of $\mathrm{C}$ and $\mathrm{H}$ is

In each molecule of carbon tetrachloride, the mass percent of carbon and chlorine respectively are _____ and _____

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 by rounding off the value to the nearest integer

$0.096 \mathrm{g}$ of stannic chloride gave $25.84 \mathrm{mL}$ of its vapour at $120°\mathrm{C}$ and $350 \mathrm{mm}$ pressure. If the chloride contains $54.6\%$ of chlorine and tin has the valency equal to $4,$ what will be the atomic weight of tin?

Round-off the answer to the nearest integer.

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 $\mathrm{C}\mathrm{u}\mathrm{S}{\mathrm{O}}_4$.

How much 70% pure iron could be produced from 140 kg of 80% pure Fe₂O₃ during the preparation of iron from haematite (Fe₂O₃) 

( ${\text{Fe}}_2{\text{O}}_3+\text{C}\to \text{Fe}+{\text{CO}}_2$)
 

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?

Haemoglobin contains $0.3465\%$ of iron and consists of $4$atoms of Fe per molecule. Using the given statement, find the molecular mass of haemoglobin (in ${\text{kg mol}}^{-1}$).  Atomic mass: $\text{Fe}=558\text{u}$

What is the percentage composition of $\mathrm{Cr}$ in 1 mole of the compound ${\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7$ ?

(Atomic mass : $\text{K}=\text{39 u}; \text{Cr}=\text{52 u};\text{ O}=\text{16 u}$)

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?

${}^{\text{'}}\mathrm{R}^{\text{'}}\stackrel{1200\mathrm{K}}{⟶}\mathrm{CaO}+{\mathrm{CO}}_2$
Calculate the mass (in $\mathrm{mg}$ ) of carbon in $1.5\mathrm{g}$ sample of pure $\text{'}R$'. [Given: At. $Wt$. of $\mathrm{C}=12,\mathrm{O}=16,\mathrm{Ca}=40\mathrm{u}]$

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.