What is the mass, in milligrams, of mercury in 1.00 kg lake trout that just meets the Northern American standard of 0.50 ppm Hg?

What is the mass, in milligrams, of mercury in 1.00 kg lake trout that just meets the Northern American standard of 0.50 ppm Hg? What mass of fish, at the 0.50-ppm level, would you have to eat to ingest a total of 100 mg of mercury?

Calculating the amount of dissolved oxygen in water using Henry's Law

I am trying to calculate the amount of oxygen that will dissolve in regular water as a function of temperature in units of mg/L. So I guess I'm trying to find the equilibrium concentration vs. the saturation concentration. First, I do not seem to be able to find Henry's Law Constants for other than 25 degrees C, and the problems I am trying to work on are at temps of 40 to 50 degrees C. Where can I find these? I know this is an equation that incorporates both oxygen partial pressure and Henry's Law but I admittedly do not know the equation. So....I am trying calculate the amount of oxygen that will dissolve in water at say 45 degrees C and at 50 degrees C. My resultant dissolved... click for more

Trying to prevent conversion of naturally occurring organic acids in wood pulp to their derivative alcohols and aldehydes under temp and pressure conditions?

I have theorized....and actually have no idea if I am correct....but am trying to determine that if I chemically react certain wood-borne volatile organic acids with sodium carbonate (Na2CO3) and form respective sodium methanoate, ethanoate, benzoate etc. etc. compounds ---- and now if I subjected these sodium methanoate and ethanoate compounds to temperatures of 400 degrees F and a pressure of 400 psi, would I prevent the creation and off-gassing of methanol, formaldehyde, phenol, and acetaldehyde compounds? The bottom line....my mission is trying to prevent the original organic acids from becoming volatile air emissions from a process when subjected to temperature and pressure. See a... click for more

WATER MASS

WHAT MASS OF WATER CAN BE HEATED FROM 5.5 DEGREES C TO 55.O DEGREES C BY 9.09 x 10 to the tenth power J of heat?

Specific Heat

The specific heat of aluminum is 0.902 J g-1 C-1 at 25 C. How much heat, in kJ, does it take to raise the temperature of a 12.0 g chunk of aluminum from 15.5 C to 35.5 C? A. 0.216 kJ B. 0.0108 kJ C. 0.0180 kj D. 240 kJ E. 216 kJ