def calMolarFlowRate(SpCo, SuGaVe, CrSeAr):
    """
    calculate molar flowrate
    args:
        SpCo: species concentration [kmol/m^3] | [mol/m^3]
        SuGaVe: superficial gas velocity [m/s]
        CrSeAr: cross sectional area [m^2]
    output: 
        MoFlRa: molar flowrate [kmol/s] | [mol/s]
    """
    # try/exception
    try:
        # [kmol/m^3]*[m/s]*[m^2]
        MoFlRa = SpCo*SuGaVe*CrSeAr
        return MoFlRa
    except Exception as e:
        raise