# Which gas has molecules with the slowest average molecular...

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Exam 2 1307 F2019-A.pdf

1 )   Which gas has molecules with the slowest average molecular speed at 25 ° C ?
A ) Kr
B ) CH 4
C ) Ar
D ) N 2
E ) CO 2
2 )   Which of the following is a weak acid ?
3 )   Steam ( H 2 O ( g ) ) has a specific heat capacity of 2.01 J/g°C. Calculate q when 5.25 kg of steam is cooled from 200 ° C to 150° C.
4 )   Assuming ideal behavior , what is the density of argon gas at STP ?
5 )   Ammonia will react with fluorine to produce dinitrogen tetrafluoride and hydrogen fluoride ( used in production of aluminum , in uranium processing , and in frosting of light bulbs ) . 2 NH 3 ( g ) + 5F 2 ( g ) → N 2 F 4 ( g ) + 6 HF ( g ) How many moles of HF are expected if 42.2 mol of F 2 react completely with excess NH 3 ?
A ) 50.6
B ) 253 .
C ) 42.2
D ) 211 .
E ) 35.2
6 )   Which represents the definition of pressure
7 )   Determine the specific heat capacity of a newly developed alloy of nickel metal , given the following calorimetry results . When a 85.66 g sample of the alloy , initially at 90.0 ° C , is dropped into a coffee cup calorimeter containing 50.0 g of water at a temperature of 10.0 ° C , the alloy and water reach 25.0 ° C at equilibrium . ( Assume no heat losses , the density of water is 1.00 g/mL and the specific heat capacity of water is 4.18 J/g · ° C. )
8 )   What are the spectator ions in the reaction of HCl ( aq ) with Ag NO 3 ( aq ) ?
3 -   9 ) What volume of a 0.442 M NaOH solution is needed to neutralize 65.0 m L of a 0.296 M solution of HNO 3 ?
A ) 21.8 mL
B ) 8.71 mL
C ) 87.1 mL
D ) 43.5 mL
E ) 174 mL
9 )   What volume of a 0.442 M NaOH solution is needed to neutralize 65.0 m L of a 0.296 M solution of HNO 3 ?
10 )   A gas sample contains 4.00 g of CH 4 and 2.00 g of He . What is the volume of the sample at STP ?
11 )   Assuming no heat loss , what final temperature is expected after 50.0 g of water at 20.0 ° C is mixed with 30.0 g of water at 80.0 °C ? ( The specific heat of water is 4.18 J/g K )
12 )   Which element is oxidized in the following reaction ? Cu + 2H 2 SO 4 → CuSO 4 + SO 2 + 2H 2 O
A ) H
B ) Cu
C ) H 2 O
D ) O
E ) S
13 )   Which one of the following compounds is insoluble in water ?
15 )   The decomposition reaction of hydrogen peroxide ( H 2 O 2 ) yields oxygen gas and water . In an experiment , the reaction yielded 75.3 m L of gas collected over water at 25 ° C and 742 torr . What mass of oxygen gas was collected ? ( P water = 24 torr at 25 ° C )
16 )   In which process is Δ H = Δ E ?
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