In Duma's method of estimation of nitrogen, $0.1840 \mathrm{~g}$ of an organic compound gave $30 \mathrm{~mL}$ of nitrogen collected at $287 \mathrm{~K}$ and $758 \mathrm{~mm}$ of Hg pressure. The percentage composition of nitrogen in the compound is___________ (Round off to the Nearest Integer).
In Duma's method of estimation of Nitrogen.
$0.1840 \mathrm{gm}$ of organic compound gave $30 \mathrm{~mL}$
of nitrogen which is collected at $287 \mathrm{~K} \& 758$
$\mathrm{mm}$ of $\mathrm{Hg}$.
Given ;
Aqueous tension at $287 \mathrm{~K}=14 \mathrm{~mm}$ of $\mathrm{Hg}$.
Hence actual pressure $=(758-14)$
$=744 \mathrm{~mm}$ of Hg .
Volume of nitrogen at $\mathrm{STP}=\frac{273 \times 744 \times 30}{287 \times 760}$
$\mathrm{V}=27.935 \mathrm{~mL}$
$\because 22400 \mathrm{~mL}$ of $\mathrm{N}_{2}$ at STP weighs $=28 \mathrm{gm}$.
$\therefore 27.94 \mathrm{~mL}$ of $\mathrm{N}_{2}$ at STP weighs $=$
$\left(\frac{28}{22400} \times 27.94\right) \mathrm{gm}$
$=0.0349 \mathrm{gm}$
Hence $\%$ of Nitrogen $=\left(\frac{0.0349}{0.1840} \times 100\right)$
$=18.97 \%$
Rond off. Answer $=19 \%$
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- JEE Main
- Exam Pattern
- Previous Year Papers
- PYQ Chapterwise
- Physics
- Kinematics 1D
- Kinemetics 2D
- Friction
- Work, Power, Energy
- Centre of Mass and Collision
- Rotational Dynamics
- Gravitation
- Calorimetry
- Elasticity
- Thermal Expansion
- Heat Transfer
- Kinetic Theory of Gases
- Thermodynamics
- Simple Harmonic Motion
- Wave on String
- Sound waves
- Fluid Mechanics
- Electrostatics
- Current Electricity
- Capacitor
- Magnetism and Matter
- Electromagnetic Induction
- Atomic Structure
- Dual Nature of Matter
- Nuclear Physics
- Radioactivity
- Semiconductors
- Communication System
- Error in Measurement & instruments
- Alternating Current
- Electromagnetic Waves
- Wave Optics
- X-Rays
- All Subjects
- Physics
- Motion in a Plane
- Law of Motion
- Work, Energy and Power
- Systems of Particles and Rotational Motion
- Gravitation
- Mechanical Properties of Solids
- Mechanical Properties of Fluids
- Thermal Properties of matter
- Thermodynamics
- Kinetic Theory
- Oscillations
- Waves
- Electric Charge and Fields
- Electrostatic Potential and Capacitance
- Current Electricity
- Thermoelectric Effects of Electric Current
- Heating Effects of Electric Current
- Moving Charges and Magnetism
- Magnetism and Matter
- Electromagnetic Induction
- Alternating Current
- Electromagnetic Wave
- Ray Optics and Optical Instruments
- Wave Optics
- Dual Nature of Radiation and Matter
- Atoms
- Nuclei
- Semiconductor Electronics: Materials, Devices and Simple Circuits.
- Chemical Effects of Electric Current,