Solve the following 4 problems (5 # each) Use next blank page as needed a) PH-Wh

Question

Solve the following 4 problems (5 # each) Use next blank page as needed a) PH-What is hydroxide ion concentration [oh^-] in molarity and in [mg/L) of tomato juice having a pH of 4.1? b) 86-proof whiskey contains 43% ethyl alcohol (CH_3CH_2OH) by volume (density - 79 kg/L) What is the concentration of ethyl alcohol (in mg/L) and the theoretical oxygen demand for whiskey? c) The world reserves of coal are 1,000 billion tons, and current usage is about 8 billion tons per year, with exponential growth rate of 1.58 How long would it take to use up the current reserves? d) Use Phase Triangle to briefly explain phase change processes Using an energy-temperature diagram, explain the heating process of arctic ice (mass m specific heat C_ice, temperature -30 degree C) being heated by hot Sun to superheated vapor (specific heat C_steam, temperature 105 degree C) into the sky How much heat from Sun is needed?

Explanation / Answer

a] pH + pOH = 14

pOH = 9.9 = -log [OH-]

[OH-] = 1.258*10^-10 M

In mg/L --> mulitply by 1000*17 ---> 2.14*10^-6 mg/L

b] d = 0.79 kg /L

volume of ethyl alochol = 430 ml

mass = 0.79*430*10^-3 = 0.3397 Kg = 339.7 gms

Volume is 1 L

Concentration = 339.7*1000 / 1 = 339700 mg /L

c] A = Pe^rt

A = 1000 billion tons

P = 8 billion tons

r = rate ; t =time

t = 3.2188 years

d] i didnt know how to do

Related Questions

Navigate

• Browse (All)
• Browse S
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.