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John weighs 60 kg and is a subsistence fisherman who eats, on average, 0.1 kg of fish per day. The fish are contaminated with PCBs at a concentration of 3 mg/kg. Assuming 100% absorption of the PCBs, what is John's average daily dose of PCBs? (Please show your work and include the units in your answer. Keep two significant figures; for example, if your original answer is 1.234, keep it as 1.2.
An experiment requires 42.0 g of ethylene glycol, a liquid whose density is 1.114 g/mL. Rather than weigh the sample on a balance, a chemist chooses to dispense the liquid using a graduated cylinder.
Assuming a linear response between current and concentration, calculate the concentration of Pb(II) in the sample by (a) neglecting the information provided by the internal standard
Compute the molarity of the hydroxide ions (OH- )in a solution that has been made by adding 70.3 grams of barium hydroxide (Ba(OH)2) in H2O(water) and diluting the solution to a final volume of four litres.
What is the heat change of H 2 O If the final temperature of the mixture = 25 degree celsius?
determined using x rays methods. Remember a, b, c are unit cell dimensions . X', y' and z' are intercepts. Only the information you need is given . You may encounter as unusual rarely formed face
For each of the salts listed below indicate whether its water solution would be acidic , basic or neutral. NaBr, Na2Co3, KHSO4, KCN, NH4CH3COO, BaF2
Compare and contrast nucleophilic addition to a carbonyl under acidic and basic conditions. Why can't a Grignard reaction be achieved under acidic condition? For full points, provide mechanism for nucleophilic addition under both basic and acidic ..
Calculate the change in entropy (in J/K) when a 67.9 g of water is heated from 14.8 ºC to 74.0 ºC at 1 atm. (The specific heat is 4.184 J/(g-K).)
The density of silver is 10.5 g/mL. What is the mass (in grams) of a piece of silver with a volume of 23.6 mL
name the highly volatile liquid may cause grave danger to the environmental health amp safety and fire safety
Calculate the mass of water produced when 2.07 g of butane reacts with excess oxygen.
Determine the concentrations of Ag+ and C2O4- in a saturated aqueous solution of Ag2C2O4. Ksp = 3.5 x 10-11
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