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Drinking water in the USA cannot exceed 0.5 ppm mercury. What mass of mercury is present in 1.3 L of water at this concentration?
What is the molar concentration of mercury?
.At 25°C and 1.0 atm, 0.25 g of a gas dissolves in 1.00 L of water. What mass of the gas dissolves in 1.00 L of water at 25°C and 3.0 atm?
the combustion of a 0.519 g sample of the compound yields 1.24 g of CO2 and 0.255 g of H2O. What is the empirical formula of the compound?
If a 180 piece of gold (density =19.32 ) is hammered into a sheet measuring 2.51.0 , what is the average thickness of the sheet in meters?
Write one overall equation, using an alkali metal ion and a nitrate ion as spectator ions if needed, for the following net ionic equation: H+(aq) + OH-(aq) ? H2O(l)
NaOH and then 25.0mL of 0.5 M of your weak acid HA with 0.500M NaOH. How would the titration curves compare at 10 or 15 mL of NaOF beyond the equivalence points
The DHfus of ethanol (C2H5OH) is 4.60 kJ/mol. How many kilojoules of heat are required to melt 24.5 g of ethanol at its freezing point.
what is the purpose of anhydrous CaCl2? Why it is important that none of the solid CaCl2 be included in the final distillation of your 1-bromobutane?
The thermal decomposition of phosphate into phosphorous and molecular hydrogen is a first order reaction : 4PH3(g) -----> P(g) + 6H2(g), The half life of the reaction is 35.0 s at 680*c
A patient needs to take 625 mg of ibuprofen twice daily. The pills in the bottle are each 250. mg. How many pills does the patient need to take each time she wants the 625 mg dosage? Assume that these pills are scored and can be cut in half if ne..
Small helium-neon lasers emit 1.51 mJ/s of light at 634 nm. How many photons does such a laser emit in one minute?
The volumes of a solution containing 1.10ppm Zn+2 shown in the table below were pipetted into separatory funnels, each containing 5.00mL of an unknown zinc solution. Each was extracted with three 5-mL aliquots of CCl4 containing an excess of 8-hyd..
What is the balanced chemical reactions that takes place when h2o2, concentrated h2so4, and Cu(s) is placed in solution. One of the byproducts should be copper sulfate (CuSO4) and there is some gas evolution during the reaction.
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