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Find the mass of urea (CH4N2O) needed to prepare 48.5 g of a solution in water in which the mole fraction of urea is 7.68×10-2.
What mass of sucrose (C12H22O11) should be combined with 5.01×102 g of water to make a solution with an osmotic pressure of 8.55 bar at 300 K ? (Assume a density of 1.0 gmL-1 for the solution.)
how much isopropanol and how much water will you use to make 20 ml of a 40 isopropanol water solution? how much
a particular brand of gasoline has a density of 0.737 gml at 25 degree c. how many grams of this gasoline would fill a
Identify the weaker acid in each of the following pairs: a)HNO3 or HCO3^- b)HSO4^- or H2O c)H2SO4 or H2CO3
verify the law of multiple proportions for an element x which forms oxides having percentages of x equal to 77.4
Question- State the number of electron groups, lone pairs, and use VSEPR theory to determine the shape of the following molecules or ions.
volume of methane gas is cooled from 298 K to 149 L. If the pressure remains constant, what is the final volume?
The following table lists molar concentrations of several ions in seawater. Using a density of 1.022 g/mL for seawater
Acetylene (C2H2) can be produced from the reaction of calcium carbide (CaC2) with water. Draw the localized electron orbital model (hybridized orbital model) for the acetylide anion (C22-), showing and lone pair electron orbital.
Suppose a mixture of oxygen and nitrogen is prepared in which there are .200 mol oxygen and .500 mol nitrogen. What is the mole fraction of each gas in the mixture
In an experiment, 0.500 L of 0.020 mol L ^-1 NaOH(aq) is rapidly mixed with an equal volume of 0.020 mol L^-1 HCN(aq). Calculate the time, in seconds, required for this [OH] to decrease to 1.0×10^4 mol L^1.
A gas diffuses only 0.5 times as fast as an oxygen molecule at the same temperature. Explain what is the molecular weight of the gas
Define in common language, with appropriate instance the role played by redox-type reactions in the formation of photochemical smog.
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