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Molecular mass of a substance at NTP?

  1. Jul 11, 2012 #1
    M g of a substance when vapourised occupy a volume of 5.6L at NTP, molecular mass of the substance will be?

    Here, what does the NTP refer to [normal temperature pressure????????]
    options are
    M, 3M, 2M, 4M
     
  2. jcsd
  3. Jul 11, 2012 #2

    tiny-tim

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    i guess so

    from http://www.engineeringtoolbox.com/stp-standard-ntp-normal-air-d_772.html

    STP - Standard Temperature and Pressure
    STP is commonly used to define standard conditions for temperature and pressure which is important for the measurements and documentation of chemical and physical processes:

    • STP - Standard Temperature and Pressure - is defined by IUPAC (International Union of Pure and Applied Chemistry) as air at 0°C (273.15 K, 32°F) and 105 pascals
    • STP - commonly used in the Imperial and USA system of units - as air at 60°F (520 °R) and 14.696 psia (15.6°C, 1 atm)
    Note that the earlier IUAPC definition of STP to 273.15 K and 1 atm (1.01325 105 Pa) is discontinued.

    1 Pa = 10-6 N/mm2 = 10-5 bar = 0.1020 kp/m2 = 1.02x10-4 m H2O = 9.869x10-6 atm = 1.45x10-4 psi (lbf/in2)

    NTP - Normal Temperature and Pressure
    NTP is commonly used as a standard condition for testing and documentation of fan capacities:

    • NTP - Normal Temperature and Pressure - is defined as air at 20°C (293.15 K, 68°F) and 1 atm (101.325 kN/m2, 101.325 kPa, 14.7 psia, 0 psig, 29.92 in Hg, 760 torr). Density 1.204 kg/m3 (0.075 pounds per cubic foot)
    SATP - Standard Ambient Temperature and Pressure
    SATP - Standard Ambient Temperature and Pressure is also used in chemistry as a reference:

    • SATP - Standard Ambient Temperature and Pressure is a reference with temperature of 25°C (298.15 K) and pressure of 101 kPa.
     
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