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melting-point ranges are determined in glass apparatus this means that glass constitutes an impurity in the system why
a 2500 ml sample of sulfuric acid h2so4 required 2126 ml of 0124 ml n naoh to titrare it to the endpointa calculate the
an isotonic solution contains 087 by mass per volume calculate the percent mass per volume for isotonic solutions
plutonium-241 has a half-life of 144 years and decays to am-241 em-241 has a half life of 4327 years and decays to
sulfur-35 is used in some medical procedures the physical half-life of s-35 is 872 days if the effective half-life of
an ancient piece of wood contains 2 grams of carbon and is found to have 10 c-14 disintegrations per minute per gram of
the amount of 250 mol of a perfect gas is heated from 1000 k to 3200 k as a result the gas expands against a constant
changing the reaction buffer to extremly high ph with addition of sodium carbonate is said to stop the reaction what 2
a 500 ml sodium iodide solution was prepared by dissolving 307 grams of solid nai in water chlorine gas was bubbled
chemical analysis of an ether shows 6482 c 1360 h and 2158 o by mass determine the empirical formula for this
a 400-g sample of iodine was reacted completely with excess bromine the mass of the compound formed was 1156 g
the atmosphere of mars has a mass of 25 1016 kg and comprises of two major species carbon dioxide 95 and nitrogen gas
explain the increase in temperature of the tris solution as you titrated it to ph 8 note that room temp is generally 22
if 110 g of ethanol is needed for a chemical reaction how many litres of ethanol would be required the density of
a certain gas is present in a 130 l cylinder at 30 atm pressure if the pressure is increased to 60 atm the volume of
determine the molality of a solution of ethanol dissolved in methanol for which the mole fraction of ethanol is
a quantity of n2 occupies a volume of 15l at 300k and 12atm the gas expands to a volume of 31l as the result of a
if i have 500 g of mgoh2 what volume of 01234 m hcl would i require to completely neutralize the magnesium
a mixture of 131 grams of zn and 220 g i2 is reacted to completion in a closed evacuated container what are the
0330 mol of hi are introduced to an evacuated 300l reaction vessel at a specific temperaturethe rquilibrium constant is
2no g 3f2g yields 2nof3g suppose 020 mol of no and 030 mol of f2 are added to a 50-l container if x mol of nof3 is
express the molecular weight of k2cr2o7 with the correct number of significant figures and find its
a carboxylic acid is soluble in organic solvent but its carboxylate anion is not explain why and what it should be
when comparing of the number of copper atoms in a penny with the number of people on earth this illustrates thata in a
a chemist must dilute 772ml of 684 um aqueous silver ii oxide ago solution until the concentration falls to 500 um