Calculate the enthalpy change when a 100 g of water is


1. Calculate the standard enthalpy change, ΔHo, for the formation of 1 mol of strontium carbonate (the material that gives the red color in fireworks) from its elements.

Sr(s) + C(graphite) + 3/2O2(g) → SrCO3(s)

The information available is

(1) Sr(s) + 1/2O2(g) → SrO(s)     ΔHo = -592 kJ

(2) SrO(s) + CO2(g) → SrCO3(s)     ΔHo = -234 kJ

(3) C(graphite) + O2(g) → CO2(g)     ΔHo = -394 kJ

2. The combination of coke and steam produces a mixture called coal gas, which can be used as a fuel or as a starting material for other reactions. If we assume coke can be represented by graphite, the equation for the production of coal gas is

2C(s) + 2H2O(g) →CH4(g) + CO2(g)

Determine the standard enthalpy change for this reaction from the following standard enthalpies of reaction:

(1) C(s) + H2O(g) → CO(g) + H2(g)    ΔHo = 131.3 kJ

(2) CO(g) + H2O(g) → CO2(g) + H2(g)    ΔHo = -41.2 kJ

(3) CH4(g) + H2O(g) → 3H2(g) + CO(g)     ΔHo = 206.1 kJ

3. The enthalpy change due to a temperature change is a change in

A. kinetic energy.
B. potential energy.

4. An enthalpy change at constant temperature and pressure is designated by the symbol
A. q
B. H
C. ΔH
D. c

5. The molar enthalpy change for a process is designated by the symbol
A. q
B. H
C. ΔH
D. c

6. Another word for melting is _______________.

7. Another word for boiling is _______________.

8. Calculate the enthalpy change when a 10.0 g of water is heated from 10.0°C to 25.0°C. Show working.

9. Calculate the enthalpy change when 10.0 g of water at 100°C is converted to 10.0 g of Vapor at 100°C. Show work.

10. Calculate the total change in enthalpy when 100 g of ice at -5.00°C is converted to water at 85.00°C. Show work (hint show two q and one ΔH.)

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Chemistry: Calculate the enthalpy change when a 100 g of water is
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