Home
Class 11
CHEMISTRY
Find the number of electrons inn a drop ...

Find the number of electrons inn a drop sulphuric acid weighing `4.9xx10^(-3)`mg [assume it to be cent percent pure].

Text Solution

Verified by Experts

`4.9xx10^(-3)mg=4.9xx10^(-6)g`
Molecular mass of `H_(2)SO_(4)=98`
`therefore`Its gram-molecular mass=98g
Number of molecules in 98g of `H_(2)SO_(4)=6.022xx10^(23)`
So, number of molecules in `4.9xx10^(-6)`g of `H_(2)SO_(4)`
`=(6.022xx10^(23)xx4.9xx10^(-6))/(98)=3.011xx10^(16)`
Atomic numbers of H, S and O are 1, 16 and 8 respectively. so, the number of electrons in them are 1, 16 and 8.
`therefore`Total number of electrons present in 1 molecule of `H_(2)SO_(4)=(2xx1+1xx16+4xx8)=50`
`therefore3.011xx10^(16)` number of `H_(2)SO_(4)` molecules contain
`=3.011xx10^(16)xx50=1.5055xx10^(18)` electrons.
Thus, `4.9xx10^(-3)mg` of `H_(2)SO_(4)` have `1.5055xx10^(18)` number of electrons.
Promotional Banner

Topper's Solved these Questions

  • SOME BASIC CONCEPTS OF CHEMISTRY

    CHHAYA PUBLICATION|Exercise WARM UP EXERCISE|77 Videos

  • SOME BASIC CONCEPTS OF CHEMISTRY

    CHHAYA PUBLICATION|Exercise QUESTION ANSWER ZONE FOR BOARD EXAMINATION (VERY SHORT ANSWER TYPE)|15 Videos

  • s-BLOCK ELEMENTS

    CHHAYA PUBLICATION|Exercise PRACTICE SET|16 Videos

  • STATES OF MATTER : GASES AND LIQUIDS

    CHHAYA PUBLICATION|Exercise PRACTICE SET|10 Videos

Similar Questions

Explore conceptually related problems

Find the number of neutrons present in 5xx10^(-4) mol of ""^(14)C isotope.

Angular momentum of an electron in an orbit hydrogen atom is 4.2xx10^(-34) J*s . What is the energy of that electron in that orbit? Given mass of an electron = 9.1xx10^(-31)kg ,e=1.6xx10^(-19)C,1eV=1.6xx10^(-19) erg .

A particle is moving 3 times faster than the speed of electron. If the ratio of wavelength of a particle and electron is 1.8xx10^(-4) , then particle is

The number density of conduction electron in copper is 8.5xx10^28(m^-3) and the mean free time between two collision is 2.5xx10^-14 s. What is the conductivity of copper ?

Estimate the average drilft velocity of conduction electrons in a copper wire of cross-section 20xx10^-3 cm^2 carrying a current of 20A. Assume the density of conduction electrons to be 9X10^28 m^3 .

Find the number of photons emitted per second by a source of power 25W. Assume, wavelength of emitted light = 6000Å. h = 6.62 xx 10^(-34)J.s

A copper wire of diameter 2/(3sqrtpi)mm is carrying a current of 1 amp. Calculate the number of free electrons which flow past any cross section of the wire per sec Also find the average speed with which free electrons are flowing in the copper wire assuming that there is one free electron per atom of copper. Number of atmos per cm^3 of copper =9 times 10^22 , electronic charge =1.6 times 10^-19 coulomb.

A conductor is charged with 14.4 xx 10^(-19) C. Determine the number of deficit of electrons in it. What will be the change in mass of the conductor?

Estimate the average drift speed of conduction electrons in a copper wire of cross-sectioal area 1.0xx10^(-7)m^2 carrying a current of 1.5 A. Assume that each copper atom contributes roughly one conduction electron. The density of copper is 9.0xx 10^3 kg//m^3 and its atomic mass is 63.5.

Consider 3rd orbit of He^+ (Helium), using non-relativistic approach , the speed of electron in this orbit will be [given k=9xx10^(9) constant, Z=2 and h(Planck's constant) =6.6 xx10^(-34)J*s ]