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4 July, 12:13

Liquid toluene is flowing through a pipe at a rate of 175 m 3 / h 175m3/h. What is the mass flow rate of this stream in kg/min? What is the molar flow rate in mol/s? In fact, the answer to Part (a) is only an approximation that is almost certain to be slightly in error. What did you have to assume to obtain the answer?

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  1. 4 July, 12:29
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    (a) Mass flow rate is 2528.75 kg/min

    (b) Molar flow rate is 458.1 mol/s

    (c) Toulene is in-compressible at standard temperature and pressure

    Explanation:

    The volume flow rate of liquid toulene is given:

    Volume Flow Rate = 175 m^3/h

    Density of Liquid Toulene = 867 kg/m^3

    Molar mass of Toulene = 92 g/mol = 0.092 kg/mol)

    (a)

    Thus, the mass flow rate of toulene will be:

    Mass Flow Rate = (Volume Flow Rate) (Density)

    Mass Flow Rate = (175 m^3/h) (867 kg/m^3)

    Mass Flow Rate = (151725 kg/h) (1 h/60 min)

    Mass Flow Rate = 2528.75 kg/min

    (b)

    Now, for molar flow rate we use formula:

    Molar Flow Rate = (Mass Flow Rate) / (Molar Mass)

    Molar Flow Rate = (2528.75 kg/min) / (0.092 kg/mol)

    Molar Flow Rate = (27486.41 mol/min) (1 min/60sec)

    Molar Flow Rate = 458.1 mol/s

    (b)

    The assumption is that Toulene is in-compressible at standard temperature and pressure. So, that its density can be taken constant.
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