Question

1.) Using standard heats of formation, calculate the standard enthalpy change for the following reaction.

 

C(s,graphite) + O2(g)CO2(g)

 

ANSWER: __________ kJ

 

2.) Using standard heats of formation, calculate the standard enthalpy change for the following reaction.  

 

CaCO3(s)CaO(s) + CO2(g)

 

ANSWER: ___________ kJ

 

3.) A scientist measures the standard enthalpy change for the following reaction to be 214.3 kJ :

 

CH4(g) + H2O(g)3H2(g) + CO(g)

 

Based on this value and the standard enthalpies of formation for the other substances, the standard enthalpy of formation of H2O(g) is _________ kJ/mol.

 

4.) A scientist measures the standard enthalpy change for the following reaction to be 209.8 kJ :

 

CH4(g) + H2O(g)3H2(g) + CO(g)

 

Based on this value and the standard enthalpies of formation for the other substances, the standard enthalpy of formation of CH4(g) is _________ kJ/mol.

 

5.) The following thermochemical equation is for the reaction of iron(III) oxide(s) with hydrogen(g) to form iron(s) and water(g).

Fe2O3(s) + 3H2(g)2Fe(s) + 3H2O(g) H = 98.8 kJ

When 61.3 grams of iron(III) oxide(s) react with excess hydrogen(g), kJ of energy are _________ evolved or absorbed?

 

6.) The following thermochemical equation is for the reaction of sodium(s) with water(l) to form sodium hydroxide(aq) and hydrogen(g).

2Na(s) + 2H2O(l)2NaOH(aq) + H2(g) H = -369 kJ

When 7.13 grams of sodium(s) react with excess water(l), kJ of energy are _________ evolved or absorbed?

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