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A new method for the determination of mercury in oyster tissue is compared with NIST SRM 1566B (Oyster tissue). The NIST standard is said to contain 0.0371 mg/kg mercury in oyster tissue. Five replicates through the new method gave a mercury content of 42 ppb with a standard deviation of 2 ppb.
Perform a t-test at the 95% confidence level to determine if the new method contains bias.
What is the calculated value of t for the new method (to two sig. figs)?
What is the critical value of t (to two sig. figs)?
Does the new method contain bias at the 95% confidence level?
What is the pH of a buffer solution containing 0.155 mol dm-3 of benzoic acid and 0.315 mol dm-3 sodium benzoate.
Change in heat content We write H = Hfinal - Hinitial or for chemical reactions H = Hproducts - Hreactants Given this equation, What sign is H for exothermic reactions? What sign is H for endothermic reactions?
calculate the molar mass of a vapor that has a density of 7.535 gl at 14degc and 743
how many molecules of carbon dioxide are produced when 134 molecules of acetylene hcch to react in excess oxygen
Calculate the concentration of ALL species in a 0.25 M solution of ethylammonium chloride (EtNH4Cl). The Kb value for the weak base ethylamine (EtNH2) is 5.6 x 10^-4.
A stream of air (21% O2 m, the rest N2) flowing at a rate of 10.0 kg/h is to be mixed with a stream of CO2 inside a mixer. The CO2 enters the mixer at a rate of 20.0 m/h at 150 ?C and 1.5 bar. What is the mole percent of CO2 in the product stream
The inversion of compound B is experimentally determined to follow the rate law: d[B]/dt = -k[B]a[H+]b. At 25 °C and a constant pH of 3.00, the reaction proceeds with a constant half-life of 40.0 min. At this same temperature, but at a constant pH..
Draw structural formulas for propanal and propanone. From these formulas, do you think that aldehydes and ketones are isomeric with each other? Show evidence and substantiate your answer by testing with a four carbon aldehyde and ketone.
What is the mass of a piece of aluminum that is found to displace 13.4 ml of water and has a density of 2.66 g/cm^3
A flask contains 0.230 mols of liquid bromine Determine the number of bromine molecules present in the flask.
Water vapor will react reversibly with methane (CH4) to produce carbon monoxide and hydrogen gas. The equilibrium, with a Kc = 0.26, is established at 9270C in a 0.32L flask which contains 0.26mol CO, 0.091mol H2, and 0.041mol CH4. What is the con..
assume the pacific ocean has a surface area of 1.7 x 108 km2 and an average depth of 3900 m. calculate the volume of
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