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A 1.00 g sample of stream water was found to contain 5.0*10-6 g lead. calculate the concentration of lead in the stream water in units of % (m/m),ppt and ppm. which is the most suitable unit?
A gas mixture composed of helium and argon has a density of 0.605g/L at a 741mmHg and 298K .What is the composition of the mixture by volume?
What is [Pb^2+] in a saturated solution of PbCO3 if Na2CO3,with a common ion is added to give [CO3^2-]=3.0x10^-4 M? PbCO3 Ksp=7.4x10^-14
Trimethylamine, (CH3)3N, has a Kb= 7.4x 10^-5. What is the percent dissociation of a 0.15 M solution of this base in water
a 3.00 l helium balloon initially at stp floats up to an altitude of 10 km where the pressure is 200.0 torr and the
Draw the polymer that results from phthalic anhydride and glycerol. d. Are these addition or condensation polymers? e. Describe and explain the differences between the polymers formed from the reaction of phthalic anhydride with ethylene glycol ve..
P4(s) + 6F2(g) --> 4PF3(g) How many grams of fluorine are needed to react with 6.20g of phosphorus?
If a solution containing 43.297 g of mercury(II) acetate is allowed to react completely with a solution containing 12.026 g of sodium sulfate, how many grams of solid precipitate will be formed. How many grams of the reactant in excess will remain..
What is the most common oxidation state of the chalcogens compared to the halogens? What is an explanation for the difference?
What is the % yield of the reaction. Also what will happen if you place two electrodes in a solution of your product and connect the electrodes to the battery. What will occur
A 460 g chunk of iron is removed from an oven and plunged into 370 g water in an insulated container. The temperature of the water increases from 25 degrees C to 86 degrees C. what must have been the original temperature of the iron
Calculate the empirical formula for each of the following natural flavors based on their elemental mass percent composition. Express your answer as a chemical formula.
While mercury is very useful in barometers, mercury vapor is toxic. Given that mercury has a DHvap of 56.9 kJ/mol and its normal boiling point is 356.7°C, calculate the vapor pressure in mm Hg at 25°C. the answer is 4.29 x 10-3 mm Hg
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