Chemistry: Matter and Change

Section 3: Thermochemical Equations

Self Check Quizzes

1
How much heat is evolved when 27.0 g of glucose is burned according to this equation?

C6H12O6 + 6O2 → 6CO2 + 6H2O; Δ H comb. = -2808kJ
A)136 kJ
B)280 kJ
C)421 kJ
D)421 J
2
Calculate the amount of heat absorbed by 10.0 grams of ice at -15.0°C as it is converted to liquid water at 50.0°C. The specific heat of H2O(s) = 2.09 J/(g °C). The specific heat of H2O(l) = 4.18 J/(g °C). The molar enthalpy (heat) of fusion is 6.01 kJ/mol.
A)5.73 kJ
B)0.676 kJ
C)0.170 kJ
D)2.83 kJ
3
A fuel is found to release 3280 kJ of heat when 0.600 moles of the fuel is burned. Which of the fuels listed in the table is the most likely to be this fuel?

<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/007874637x/514711/table_15_3.jpg','popWin', 'width=450,height=226,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (43.0K)</a>
A)sucrose
B)octane
C)propane
D)methane
4
Spraying ethanol on your hand makes your hand feel cool. How much heat is absorbed in turning 3.00 grams of ethanol from a liquid to a vapor?

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A)115.8 kJ
B)1.19 kJ
C)0.321 kJ
D)2.51 kJ
5
A hydrogen balloon containing 0.250 moles of hydrogen gas explodes in the presence of oxygen such that all the hydrogen reacts. How much heat is released?

H2(g) + (1/2)O2(g) → H2O + 286 kJ
A)143 kJ
B)286 kJ
C)71.5 kJ
D)0.25 kJ
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