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The following pH data were collected in the analysis of water from an upstate New York lake as part of an acid rain study: 4.17, 4.20, 4.19, 4.23, 4.22, 4.14, 4.20, and 4.15. Calculate the following.
(a) mean
(b) median
(c) percent average deviation
(d) percent standard deviation
describe how chlorine gas is produced in electrolysis
II. Describe the spontaneity and entropy of the processes.
1. Formation of CO2 and H2O through the reaction below.
C3H8(g) + 5O2(g) → 3CO2(g) + 4H2O(l)
2. Sublimation of naphthalene balls as represented by this equation:
C10H8(s) → C10H8(g)
3. Formation of H2O from H2 and O2 2H2(g) + O2(g) → 2H2O(l)
. 30.0 g H2O at an unknown temperature is mixed with 27.0 g of water at 15.8oC in a coffee-cup calorimeter. If
the final temperature of the mixture is 29.1oC, what is the initial temperature of the water?
Compare the amount of heat given off by 1.40 mole of liquid water when it cools from 100.0 oC to 30.0 oC to
that given off when 1.40 mol of steam cools from 200.0 oC to 110.0 oC ( Cp H2O (l) = 4.184 j/g-oC , Cp H2O (g)
= 1.87 J/j-oC) . Explain your comparison
. If 35.0 g H2O at 22.7°C is combined with 65.0 g H2O at 87.5°C, what is the final temperature of the
mixture? The specific heat capacity of water is 4.184 J/g⋅°C.
A coffee-cup calorimeter contains 50.0 g of water at 60.51°C. A 12.4 g piece of graphite at 24.21°C is
placed in the calorimeter. The final temperature of the water and the carbon is 59.02°C. Calculate
the specific heat of carbon. The specific heat of water is 4.18 J/g⋅°C.
what is the concentration of a solution with a volume of 3.3ml that contains 12 grams of ammonium sulfite((NN4)2SO3)
Find the resulting temperature when 100 g of ice at 0oC is mixed with 1 liter of H2O at 35oC.
Characterization of elements according to periodic table
Example., P-phosphorus, period-5, group-15 or Va; atomic number Z=15, number of protons P=15, number of electrons e=15; relative atomic mass Ar=31; nonmetal
