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a 1000g sample of red phosphorus powder was burned in air and reacted with oxygen gas to give 2291g of phosphorus oxide
a pendulum consists of a mass m 0120 kg hanging from a flexible string of length l the string is very thin very light
what is the maximum number of electrons in an atom whose highest-energy electrons have the principal quantum number
the speed of sound in air is 344 ms at room temperature the lowest frequency of a large organ pipe is 30 s-1 and the
a hoop and a disk both of 072- m radius and 50- kg mass are released from the top of an inclined plane 30 m high and 71
a stereospecific reaction is a reaction in which each of two stereoisomers of a starting material yields a particular
a car travels along a straight stretch of road it proceeds for 157 mi at 55 mih then 222 mi at 49 mih and finally 376
a buffer solution is prepared by adding 020 mole of nh3 and 030 mole of nh4cl to enough h2o to make one liter of
a playground merry-go-round has a disk-shaped platform that rotates with negligible friction about a vertical axis the
calculate the ph of the buffer prepared by mixing 350ml of 015m hc2h3o2 with a 250ml of 010m nac2h3o2 ka for hc2h3o2
find the de broglie wavelength of an oxygen molecule of average kinetic energy in air at a temperature of 2260 k the
a uniform 215- kg spinning disk with a radius of 0233 m is brought to rest by a brake-pad pressed against the side 0149
an amount of an ideal gas expands from 105 l to 223l at a constant pressure of 10atm then the gas is cooled at a
the pressure-volume graph shows an engine cycle where the working substance is an ideal monatomic gas 53 the process
what concentration of monobasic and dibasic sodium phosphate should be used to get ph
air streams horizontally past a small airplanes wings such that the speed is 620 ms over the top surface and 520 ms
what is the ionization constant of an acid if the hydronium ion concentration of a 0500 m solution is 170 x 10-4
during a lunar eclipse the moon earth and sun all lie on the same line with the earth between the moon and the sun the
given ka values of 10 x 10-10 and 68 x 10-8 for c6h5oh and c5h5nh respectively calculate the equilibrium constant for
in seawater a life preserver with a volume of 400times102 m3 will support a 700 kg person average density 980 kgm3 with
after a strenuous exercise session someone experiences sever cramps in the ghighs and pain in the biceps what chemical
what is the hydronium ion concentration of a 0110 m acid solution of an acid whose ionization constant is 545 x
the following organic chemicals are used during the oxidation of 9-hydroxyfluorene to fluorenone briefly explain how
you have a 200 ohm resistor a 0400 h inductor and a 600 mf capacitor suppose you make a series circuit with the
is it theoretically possicle to separate 9999 of 010m ki from 010m kbr by controlled-potential