posted 10 months ago

a. What exponential rate of growth would have resulted in the population in 1960, which was 3billion? (Answer:r = 7.5*103 yr')

b. At this growth rate, what is the doubling time for this population? (Answer: Td = 92.4 yrs)

C.If this rate continued, what would the population have been in the year 2015?

d. Is your answer for part c) larger or smaller than the actual world population in 2015? What does this result mean in terms of how the rate of growth changed between 1800-1960 and1960-2015?

posted 10 months ago

\mathrm{HNO}_{3} \leftrightarrow \mathrm{H}^{+}+\mathrm{NO}_{3}^{-}

posted 10 months ago

а.When will the world population reach 9 billion? (Answer: 2037)

b. What will the population be in 2050? (Answer: N = 9.45 billion = 9.45 x 10º)

b. What will the population be in 2050? (Answer: N = 9.45 billion = 9.45 x 10°)

posted 10 months ago

\mathrm{C}_{8} \mathrm{HO}_{2} \mathrm{~N}+8 \mathrm{O}_{2} \rightarrow \mathrm{MH}_{3}+8 \mathrm{CO}_{2}+2 \mathrm{H}_{2} \mathrm{O}

\mathrm{NH}+2 \mathrm{O}_{2} \rightarrow \mathrm{NO}_{3}+\mathrm{H}+\mathrm{HzO}^{\mathrm{O}}

posted 10 months ago

M n(O H)_{2} \leftrightarrow M n^{2+}+2 O H^{-}

posted 10 months ago

posted 10 months ago

b) Determine Henry's law constant of ammonia in water at 25 °C from the tabulated (g) and (ag) Gibbs energies of formation.

c) Generate an entry for the Gibbs energy of formation of CO based on the standard state for aqueous solutes

d) N2O gas is bubbled through water at 12 bar, 10 °C. Calculate the activity of N2O (aq) and of water (1) in the liquid based on the indicated standard states.

posted 10 months ago

3 \mathrm{H}_{2}+\mathbf{N}_{2}=2 \mathrm{NH}_{3}

a) Calculate the minimum and maximum values of .

b) Calculate all mole fractions when the mole fraction of helium is 0.3. What is the conversion of hydrogen?

c) Calculate all mole fractions when the mole fraction of helium is 0.215. What is the conversion of hydro-gen?

posted 10 months ago

a) Assume the heat capacities of all species to be constant and equal to their value at 25 °C.

b) Assume the heat capacities to be functions of temperature.

posted 10 months ago

3 a) Calculate the standard heat of reaction for the complete combustion of methane at 800 °C.

b) Calculate the amount of heat that is released in a furnace that burns methane in 20% excess air, if the furnace temperature is 800 °C at the pressure is 2 bar. Assume that the inlet gases are already at 800°C asthe enter the furnace.

c) Repeat part b but this time the inlet gases are at 40°C, 2 bar.

Additional data: Assume that the reaction is complete and that products are carbon dioxide and water.The heat capacities of the gases are given in Problem ??.