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how many moles of nh4cl must be added to 10 l of 10 m solution of nh3 to prepare a buffer solution with a ph of 900 of
a 769-kg satellite is in circular orbit around the earth and moving at a speed of 111 kms how much work must be done to
precision calipers were used to measure a face-centered unit cell of cu the dimension of the unit cell is 03616nm
a solution of potassium permaganate is standardized with iron metal a primary standard the iron is dissolved in acid
125 moles of nocl were placed in a 250 l reaction chamber at 427ordmc after equilibrium was reached 110 moles of nocl
calculate the ph of each of the following solutions containing two solutes in the concentrations indicated a 050 m hoac
a student poured the hydrogen peroxide unknown into a clean wet erlenmeyer flask the stdent thought that as long as the
a 70 m3 incompressible box is completely submerged in a fluid what volume of fluid is displaced by the box if the fluid
in the first determination a student heated the solution of hydrogen peroxide and sulfuric acid before titration later
a bullet is fired from a gun whose barrel is 0600 m long the bullets mass is 500 g and its velocity is 300ms when it
5 if molten metal is dropped quickly onto a highly chilled surface it is possible that the metal may become supercooled
the drawing shows a person weight w 582 n l1 0841 m l2 0406 m doing push-ups find the normal force exerted by the
an unknown mass is placed on one side of the atwoods machine the downward acceleration of the mass 5kg is observed to
a spacecraft moving away from earth emits a 4346 hz signal a scientist on earth measures the signal to be 4344 hz what
draw resonance structures to show in which position 4-methylacetanilide will undergo
aluminum has a density of 299 grams per cubic cm and a specific heat of 022 calories per gram degree celsius a cube of
the vapor pressure of dichloromethanech2cl2at 0 degree c is 134mmhg the normal boiling point of dichloromethane is 40
how long would it take for 150 mol of water at 1000 degrees c to be converted completely into steam if heat were added
using the henderson-hasselbalch equation calculate the ph of an ammonia buffer when the nh3nh4 ratio is 04 moles06
a radio station with a power of 20 kw sends out an omnidirectional wave at 125 mhz if the electromagnetic wave has an
a solution at ph 7 contains a weak acid ha the pka of the acid is 65 what is the ratio of a-ha note the negative next
a ball with mass 1kg is dropped from a height of 6m the ball is caught by a person 2m above the grounda how much work
draw a structure for each isomer of dimethylcyclopropane label each proton a b c etc to indicate the number of signas
an underdamped spring-mass system consists of a spring with a force constant of 200 nm and a mass of 550 g it is
two masses are separated by 385m the mass of objects are 598kg and 735 kg how far is the center of mass of the