1) A gas is compressed from an initial volume of 5.70L to a final volume of 1.20

Question

1) A gas is compressed from an initial volume of 5.70L to a final volume of 1.20L by an external pressure of 1.00 atm. During the compression the gas releases 126J of heat.
What is the change in internal energy of the gas? Delta E= ?
2) Titanium reacts with iodine to form titanium(III) iodide, emitting heat. 2Ti(s)+3I2(g)?2TiI3(s)DeltaHorxn = -839 kJ
Determine the masses of titanium and iodine that react if 1.56×103kJ of heat is emitted by the reaction.
Express your answer to three significant figures and include the appropriate units.
3) A 2.63g sample of a substance suspected of being pure gold is warmed to 72.3?C and submerged into 16.0g of water initially at 24.0?C. The final temperature of the mixture is 26.6?C.
a) What is the heat capacity of the unknown substance?
Express your answer using two significant figures
b)Could the substance be pure gold?

Explanation / Answer

You have 3 distinct problems here. I am rewarded only for one!

1.

dE = pdV

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