A) B) C) D) A gas expands in volume from 28.6 raL to 74.4 raL at constant temper

Question

A)

B)

C)

D)

A gas expands in volume from 28.6 raL to 74.4 raL at constant temperature. Calculate the work done (in joules) if the gas expands against a constant pressure of 3.2 atm. Enter your answer in scientific notation. Be sure to answer all parts. A gas expands in volume from 28.6 raL to 74.4 raL at constant temperature. Calculate the work done (in joules) if the gas expands against a constant pressure of 3.2 atm. Enter your answer in scientific notation. A63.55-g stainless steel ball bearing at 100.47degreeC is placed in a constant-pressure calorimeter containing 110.1 g of water at 19.55degreeC. If the specific heat of the ball bearing is 0.474 J(gdegreeC), calculate the final temperature of both the water and steel when they equilibrate. Assume the calorimeter to have negligible heat capacity A0.2175-g sample of solid magnesium is burned in a constant-volumc bomb calorimeter that has a heat capacity of 3024 J/C. The temperature increases by 1.782degreeC.

Explanation / Answer

A) W = -PdV

= - 3.2 * (74.4 - 28.6) * 10^-3

= - 0.15

B) 63.55 * 0.474 * ( 100.47 - T) = 110.1 * 1 * (T - 19.55)

30.12 * (100.47 - T) = 110.1 * (T - 19.55)

3026.16 - 30.12T = 110.1T - 2152.46

140.22T = 5178.62

T = 36.93

C) a) 0.2175 * 3024 * 1.782 = 1172.06 J/g

= 1.17 KJ/g

now moles of = 0.2175 / 24 = 0.009 moles

b) energy = 1.17 / 0.009 KJ/mol

= 130 KJ/mol

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