16.What is the work performed by a gas if it expands from 3.44 L to 6.19 L against a constant external pressure of 1.26 atm? Express the final answer in joules. (W=P x dV)

Chemistry: An Atoms First Approach
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Chapter7: Chemical Energy
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16.What is the work performed by a gas if it expands from 3.44 L to 6.19 L against a
constant external pressure of 1.26 atm? Express the final answer in joules. (W=P x dV)
17.Calculate the heat involved when 25.0 g of Fe increase temperature from 22° C to 76°C.
The specific heat of Fe is 0.449 J/g• °c. (Q = ms(t2-t¡)
18.Nitrogen gas reacts with oxygen gas to make NO(g) while absorbing 180 W. Is this
process exothermic or endothermic?
19.Given the thermochemical equation: N2(g) + 3H2(g) + 2NH3(g) AH =-91.8kJ
How much heat is given off when 1.00 g ofH2 reacts?
20.What is the work when 2,345 mL of gas contract to 887 ml- under an external pressure of
348 torr? (1 mmHg = 1 torr) (W = P x dV)
Transcribed Image Text:16.What is the work performed by a gas if it expands from 3.44 L to 6.19 L against a constant external pressure of 1.26 atm? Express the final answer in joules. (W=P x dV) 17.Calculate the heat involved when 25.0 g of Fe increase temperature from 22° C to 76°C. The specific heat of Fe is 0.449 J/g• °c. (Q = ms(t2-t¡) 18.Nitrogen gas reacts with oxygen gas to make NO(g) while absorbing 180 W. Is this process exothermic or endothermic? 19.Given the thermochemical equation: N2(g) + 3H2(g) + 2NH3(g) AH =-91.8kJ How much heat is given off when 1.00 g ofH2 reacts? 20.What is the work when 2,345 mL of gas contract to 887 ml- under an external pressure of 348 torr? (1 mmHg = 1 torr) (W = P x dV)
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V= 3.44 L , V2 = 6.19 L 

P = 1.26 atm

dV = V2 - V1 = 6.19 - 3.44 =2.75 L

 

 

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