the Cullinan Diamond, the world's largest rough gem quality diamond, weighs 621.35 g, and is estimated to have a value for $400 million. How many dollars per ounce do this equal

- lead + phosphoric acid = hydrogen + lead(ii) phosphate

answer: the value of enthalpy change will be -152.80 kj.

solution:

pressure = 1atm , temperature = = 298 k

given that pressure and temperature are same in both gases , the number of moles of both gases can be determined by the ideal gas equation.

according to reaction 3 moles no are reacting with 1 mol of ,then 0.49 mol of no will react with moles of ozone that is 0.16 moles of ozone. since, no is limiting reagent and is an excessive reagent.

enthalpy change for the reaction between the given volumes of the gases is :

some sources quote the lethal dose, for an average 170lbs opiate-naive individual is between 75 and 375 mg