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the total power used by humans worldwide is approximately 15 terawatts sunlight striking earth provides 1336 per square
how many liters of o2 gas measured at 861 torr and 2500degc are formed by the decomposition of 200 g of kclo you will
the mole fraction of calcium in the ocean is 411 x 10-4 the concentration of carbonate ion co32- is 12 x 10-7 m the
calculate the reflection loss when a beam of radiant energy passes through an empty quartz cell assuming the refractive
if you thought you had discovered a new element how could you get the scientific world to accept your discovery what
for an acid-base reaction what is the reacting species in barium
if internal ph of muscle is 68 what is the hpo4 2-h2po4 - ratio in this cell the values are pk1 212 pk2 721 and pk3
concentrated h2so4 is 96 by weight h2so4 and has a density of 184 gmml calculate the volume of concentrated h2so4 acid
a reaction mixture for an enzyme assay has a final volume of 0210 ml in the buffer 0030 m tris
at a certain temp 0500 mol of h2 and 0500 mol of i2 were placed in a 100 l container to react what concentration of hi
the total volume of seawater is 15 1021 l assume that seawater contains 31 percent sodium chloride by mass and that its
vanillin used to flavor vanilla ice cream and other foods is the substance whose aroma the human nose detects in the
an experiment requires 120 g of cyclohexane whose density at 25 degrees c is 07781 gml what volume of cyclohexane
to aid in the prevention of tooth decay it is recommend that drinking water contain 090 ppm fluoride f-a how many grams
express the concentration of a 00260 m aqueous solutioin of fluorire f- in mass percentage and in parts per million
water has a density of 1 gcm3 how much pressure would a column of water exert that has a cross sectional area of 1 cm2
calculate the mass percentage of na2so4 in a slution containing 106 g na2so4 in 483 g water b an ore contaings 286 g of
gas a2 reacts with gas b2 to form gas ab at a constant temperature the bond energy of ab is much greater that that of
calculate the quantity of sodium fluoride in kilograms needed per year for a city of 50000 people if the daily
a sheet of aluminum foil has a total area of 1000ft2 and a mass of 3539g what is the thickness of the foil the question
a copper penny can be dissolved in nitric acid but not in hydrochloric acid explain why in terms of e explain what
actually the density of air decreases as the altitude decreases halving roughly every 58 km at what approximate
air has a density of about 12 kgm3 one standard atmosphere 1 atm is about 105 pa assuming that the density of air
a 230ml of seawater contains about 400x10-10g of gold the total volume of ocean water is about 150x1021 l calculate the
if a 155g sample of zinc is heated with excess sulfur to form 231g of zinc sulfide calculate the mass of sulfur