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how many grams of dry nh4cl need to be added to 150 l of a 0500 m solution of ammonia nh3to prepare a buffer solution
the standard enthalpy of formation of nh3g is -460 kjmol calculate the thermal energy evolved when 80g of h2g react
if the pressure of a gas is 6149 atm in a piston what is the pressure in atm if the volume of the piston is increased
a man enters a tall tower needing to know its height he notesthat a long pendulum extends from the ceiling almost to
when four people with a combined mass of 320 kg sit down in a car they find that the car drops100 cm lower on its
as shells are filled by electrons which are filled first inner or outer shells which has more potential energy an
if one mole of ethane gas c2h6 is burned in oxygen to co2g and h2ol with the simultaneous release of 1560 kj at
the rydberg constant depends on the mass of the nucleus what is the difference in wavenumbers of the 3p-gt1s transition
a lead bullet traveling at 350ms strikes a target and is broughtto rest what would be the rise in temperature of the
show that when a nucleus decays by decay the totalenergy released is equal to mp -md -2me where mp and md are the
what volume of a 150 by mass naoh solution which has a density of 500 l of an naoh solution with a ph of
a communications satellite with a mass of 180 kg is in a circular orbit about the earth the radius of the orbit is
mercury is 136 times as dense as liquid water what would be the reading of a water-filled barometer at normal
if you dilute 190 ml of the stock solution to a final volume of 0290 l what will be the concentration of the diluted
a cardboard milk container has two holes one above the otherpunched in its side at a given moment the two escaping
two 140 kg lead spheres are suspended from 200 m-long massless cables the tops of the cables have been carefully
a balloon was filled to a volume of 250 rm l when the temperature was rm 300circc what would the volume become if the
the buildup of plaque on the walls of an artery may decrease itsdiameter from 11 cm to 071 cm the speedof blood flow
mars travels at an average speed of 241times104 ms around the sun and takes 594times107 s to complete one revolution
the internal energy change e for the conversion of 1 mol of compound a to compound b is 02 kj both a and b are solids
a runner rounds a circular curve ofradius 240 m at a constant speed of560 ms what is the magnitude of the runners
a 50 g bullet is fired from a gun into a 10000 g block of woodsuspended on a string causing the block to swing upwards
an electron in the hydrogen atom makes a transition from an energy state of principal quantum number ni to the n2 state
kyle pushes a box across a rough floor with a horizontal force of 15n if the box has a mass of 22kg and it accelerates
sulfuric acid is added to potassium permanganate then hydrogen peroxide is added identify the product complete the