1 1 . which is not a unit of pressure? _ c. kPa d. N/cm b. Pa A gas is collected
ID: 1585381 • Letter: 1
Question
1 1 . which is not a unit of pressure? _ c. kPa d. N/cm b. Pa A gas is collected in a 4.24 L container at 0°C·The pressure of the gas is determined to be 137 kPa. Determine the number of moles of gas present. a. 0.256 moles b. 0.0209 moles 12. c. 0.0025 moles d. 5.724 moles 13. A sample of gas has a volume of 0.35 m3 and a pressure of 1.42 kPa when it is at 273 K. What will the new pressure be if it is allowed to occupy a volume of 0.63 m3 at a temperature of 340 K? a. 0.63 kPa b. 29000 kPa c. 3.2 kPa d. 0.98 kPa 14. A rectangular block with dimensions 4 cm x 4 cm x 10 cm has a weight of 750 N. By what factor is the pressure it exerts increased when it is standing on its smaller end compared to when it is lying on its side? a. 4 times c. 18.75 times d. 4.7 times b. 2.5 times 15. A hydraulic piston is used to lift 1030 N using 45 N of force. If the platform supporting the weight has an area of 1.2 m2, what is the area of the piston that force is applied to? a. 0.036 m2 b. 27.5 m2 c. 19.1 m2 d. 0.052 m2 Problem The temperature of a 2-kg metal block rises by 10°C when 8000 J is supplied to it. What is the specific heat of the metal? 16·Explanation / Answer
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11.
Answer is d)N/cm
Pressure is defined as Force per unit area
P=F/A
Therefore units of Pressure are N/m2 ,
N/m2=pa ,Kpa
12.
Answer is a)0.256 moles
From Ideal gas law
PV=nRT
n=PV/RT =(137*103)(4.24*10-3)/8.314*(273+0)
n=0.256 moles
13.
From Ideal gas law
PV/T= nR=Constant
P2V2/T2 =P1V1/T1
P2*(0.63/340) =(1.42*103)*0.35/273
P2=982.5 pa==0.98 Kpa
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