Suppose 2 kg of usgar contains `9 xx 10^6` crystals. How many sugar crystals are there in
5 kg of sugar?

Suppose 2 kg of usgar contains 9 xx 10^6 crystals. How many sugar crystals are there in 1.2 kg of sugar?

The partial pressure of ethane over a solution containing 6.56xx10^-3 g of ethane is 1 bar. If the solution contains 5.00xx10^-2 g of ethane, then what shall be the partial pressure of the gas?

A spaceship is stationed on Wlars. How much energy must be expended on the spaceship to launch it out of the solar system? Mass of the space ship = 1000 kg, mass of the Sun = 2 xx 10^30 kg, mass of mars = 6.4 xx-10^23 kg, radius of mars = 3395 km, radius of the orbit of mars = 2.28 x 10^8 kg, G= 6.67 xx 10^-11 m^2kg-^2 .

A calorie is a unit of heat or energy and it equals about 4.2 J where 1J = 1 kg m^2s^(-2)c . Suppose we employ a system of units in which the unit of mass equals a kg, the unit of length equals R m, the unit of time y s? Show that a calorie has a magnitude 4.2 a^(-1) beta(-2) gamma2 in terms of the new units.

A first order reaction has a rate constant of 10^(-2)s^( -1) . How much time will be taken for 20g of the reactant to be reduced to 5g?

Mercury has an angle of contact equal to 140^@ with soda lime glass. A narrow tube of radius 1.00 mm made of this glass is dipped in a trough containing mefcury. By what amount does the mercury dip down in the tube relative to the liquid surface outside? Surface tension of mercury at the temperature of the experiment is 0.465 N m^-1 . Density of mercury = 13.6 xx 10^3 kg m^-3

A rocket is fired from the earth towards the sun. At what distance form the earth's centre is the gravitational force on the rocket zero? Mass of the sun = 2 xx 10^20 kg and mass of earth = 6 xx 10^24 kg and orbital radius 1.5 xx 10^-8 km.