The electric force between a charged foam cup and a positively charged metal sphere is 2.12 newtons. if the charge on the cup is 2.0 × 10-6 coulombs and the charge on the metal sphere is 2.5 × 10-6 coulombs, what is the distance between the two? (k = 9.0 × 109 newton·meter2/coulombs2.

Answer : The distance between the cup and metal sphere is 0.1457 meter.

Solution : Given,

Charge on the cup =

Charge on metal =

Electric force = 2.12 Newton

coulombs constant, K =

Formula used : According to the Coulombs Law,

where,

F = Electric force

= coulombs constant

= Charge on the cup

= Charge on the metal

r = Distance between the two charged species

Now put all the given values in above formula, we get

By rearranging the terms, we get the value of 'r'

r = 0.1457 meter

Therefore, the distance between the cup and metal sphere is 0.1457 meter.

in 1783 cavendish was working with his hydrogen gas and found that when he burned it and condensed the vapor it was water. this was very significant since it disproved the greek theory of elements completely since water was not a simple substance but the product of two gases. it was lavoisier who hearing of the experiment gave cavendish's gas the name hydrogen ("water-producer") and added that hydrogen burned by combining with oxygen and that water was a hydrogen-oxygen combination.

explanation:

answer: the value of enthalpy change will be -152.80 kj.

solution:

pressure = 1atm , temperature = = 298 k

given that pressure and temperature are same in both gases , the number of moles of both gases can be determined by the ideal gas equation.

according to reaction 3 moles no are reacting with 1 mol of ,then 0.49 mol of no will react with moles of ozone that is 0.16 moles of ozone. since, no is limiting reagent and is an excessive reagent.

enthalpy change for the reaction between the given volumes of the gases is :