Calculate the total positive (or negative) charge on a 3.11 g copper penny. Given Avogadro's number `=6.023xx10^(23)(g^(-1)) mol^(-1),` and atomic mass= `63.5 g`.

Calculate the total number of electrons present in 1.6g of methane.

Estimate the number of free electrons in 1 g of water and the negative charge possessed by the. Given that Avogadro number = 6.02 xx 10^23 and molecular weight of water = 18

Tha half-life of U^(238) against alpha decays is 1.42 xx 10^(17)s .How many disintengrations per second occur in 1 g of U^(238) ?Given,Avogadro umber =6.02 xx 10^(23) mol^(-1) .

Calculate the total moles of atoms of each element present in 122.5 g of KC LO_(3)

A copper atom consists of copper nucleus surrounded by 29 electrons. The atomic weight of copper is 63.5mol e^(-1) . Let us now take two pieces of copper each weighing 10g. Let us trandfer one elcetron from one piece to another for every 100 atoms in that piece. What will be the Coulomb force between the two pieces after the trandfer of electrons, if they are 1cm apart? Avogadro number= 6xx10^(23) mol e^(-1) , charge on an electron =- 1.6xx10^(-19)C.

Assme that each of copper atom has one free electron estimate the number of free electrons in 1 mg of copper. Given that atomic weight of copper 63.5 and Avogadro number = 6.02 xx 10^23 . What is the charge possessed by these free electrons?

What is the drift velocity of electrons in a silver wire of length 1 m, area of cross-section 3.14 xx 10^-6m^2 and carrying a current of 10 A. Given, charge on electron = 1.6 xx 10^-19C , Avogadro number = 6.02 xx 10^23 atomic weight of silver = 108 and density of silver = 10.5 xx 10^3 kg m^-3 .

Estimate the average drift speed of conductin electrons in a copper wire of cross sectional 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 9.0xx10^3 kgm^(-3) and its atomic mass is 63.5 u.

Calculate the most probable speed of a molecule of hydrogen at N.T.P. The Boltzmann constant is 1.38 xx 10^-23 J per degree and Avogadro's number is 6 xx 10^26 per kg mole.