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A gas releases 45kJ of heat and does 29kJ of work. Calculate  ∆ E . Answer: [BLANK-1] kJ **Please give answer with correct sig.figs. and in the unit provided above.

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What is the enthalpy change for a reaction, and how does this differ from the experimental heat flow measured for an experiment involving the reaction?

If the internal energy of a thermodynamic system is increased by 300.J while 75J of expansion work is done, how much heat was transferred?

Consider the following reaction: 2 H 2   ( g )   +   O 2   ( g )   – >   2 H 2 O ( l )             ∆ H =   – 572 k J How much heat is evolved when 4.03 g H2 are reacted with excess oxygen? Answer: [BLANK-1] kJ *Provide answer with correct sig. figs. and in the unit indicated above.

A property that is independent of the pathway is called an intensive property.

2Al(s) + 3Cl2 (g) –> 2 AlCl3 (s)  ∆H=-1390.81 kJThe above reaction is exothermic, releasing 1390.81kJ of heat.

A neutralization reaction occurs when a salt is combined with water to form an acid and a base.

Determine the amount of heat (in kJ) given off when 1.26X104 g of ammonia are produced according to the equation N2(g) + 3H2(g) –> 2NH3(g) (delta)H(rxn) = -92.6 kJ/mol Assume that the reaction takes place under standard-state conditions at 25°C.

That part of the universe on which our attention is focused is called the