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A soil sample was examined for lead. A 1.765 gram sample was microwave digested with 30mL of nitric acid. The resulting solution was quantitatively transferred to a 50mL graduated tube as well as filled to the 50mL mark. A 1mL aliquot of the diluted digestate was then added to a separate 50mL graduated tube and filled to the 50mL mark. The sample was examined by GFAA and found to contain 15 ppb of lead. Explain how many ug/g of lead are in this soil sample?
Methyl salicylate (oil of wintergreen) is prepared by heating salicylic acid (C7H6O3) with methanol (CH3OH) C7H6O3 + CH3OH ® C8H8O3 + H2O What is the percent yield if reaction of 8.244 g of salicylic acid with an excess of methanol produced a meas..
A hot water bottle contains 960. g of water at 59 degree C. If the water cools to body temp (37 degree C), how many kilocalories of heat could be transferred to sore muscles
What quality of heat energy, in J, is required to raise the temperature of 454g of tin from room temperature, 25.0C to its melting point, 231.9C, and then melt the tin at that temperature
A 100 ml sample of rainwater is neutralized by 22.4 ml of .0122 M NaOH. Assuming that the acid present in sulfurous acid, which resulted from the reaction of SO2 with water, what is the molarity of acid in the rainwater
An atomic emission spectrum of hydrogen shows the following three wavelengths: 1875nm, 1282nm, and 1093nm. Assign these wavelengths to transitions in the hydrogen atom.
Depict the product expected from the reaction of the Grignard reagent formed from isopropyl bromide with: a) 2-methylcyclohexanone
A scuba diver with a lung capacity of 5.4 inhales a lungful of air at a depth of 48 and a pressure of 5.8. If the diver were to ascend to the surface (where the pressure is 1.0 ) while holding her breath, to what volume would the air in her lungs ..
Electrum is the name given to Au-Ag alloys when Ag exceeds 20wt%. Determine the density of electrum with exactly 20 wt %Ag. If the market price of Au and Ag are $400 per ozt and $7 per ozt respectively,
How many total moles of ions are released when the following sample dissolves completely in water? 7.24x 10^20 formula units of NiCl2.
The enthalpy change for the reaction below at 25oC is -1,850 kJ (per mole of C9H20). What is the internal energy change for the reaction at 25oC
How many moles of NaNO2 will be contained in the 1 liteer, 1.34 solution after it is made? b. What volume of concentrated 5.48 M NaNO2 solution will contain this number of moles?
Research in surface science is carried out using ultra?high vacuum chambers that can sustain pressures as low as 10?12 torr. How many molecules are there in 1.00 cm3 volume inside such an apparatus at 298 K? What is the corresponding molar volume ..
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