Exam (elaborations)
Chem 162 Exam 2 (In-Class) Practice Problems
- Module
- CAA201 - Test 3.
- Institution
- CAA201 - Test 3.
Chem 162 Exam 2 (In-Class) Practice Problems
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Chem 162 Exam 2 (In-Class) PracticeProblems
a) When Na metal reacts with water 368.6KJ of energy is evolved sulfur (S8)
burns in air to produce sulfur dioxide, reaction evolves 9.31KJ of heat per gram
of S8, write the thermalchemical equation.
b) the dissociation of 1 mol sulfur dioxide in elements
c) you burn 15.0g of S8 in air. How much heat evolves for this amount of sulfur -
CORRECT ANSWER-a) -2.39x10^-3 KJ/mol
b) +299KJ
c) -1.40x10^2 KJ/mol
How many grams of glucose needed per day? (C6H12O6)
Man: 67KJ is 1.3x10^4 KJ
Woman: 58KJ is 8.8x10^3 KJ
C6H12O6(s) + 6O2 (g) >>> 6CO2 (g) + ^H2O (l) H= -2.82x10^3 - CORRECT
ANSWER-Man: 830g of glucose
Woman:560g of glucose
A piece of zinc weight 35.8g is heated from 20.00 Celsius to 28.00 Celsius. How
much heat was required cp= 0.388J/g celsius - CORRECT ANSWER-111J
Nitromethane CH3NO2 burns O2 with reaction of
CH3NO2(g) + 3/4O2 (g) >>> CO2 (g) + 2/3 H2O(l) + 1/2 N2(g). Place 1.724g of
nitromethane with O2. Temperature is 22.23 Celsius to 28.81 Celsius. Heat
capacity is 3.044 KJ/C - CORRECT ANSWER--709KJ
Calculate energy required to heat 100.0g of water @ -18 Celsius to 200 Celsius
cp(s)= 2.11 J/g Celsius
cp(l)= 4.18 J/g Celsius
cp(g)= 1.89 J/g Celsius
Heat of fusion= 6.01 KJ/mol
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