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The diffusion coefficient of hydrogen (H2) in air is D=0.63104m2/s at 293K and 1atm. By comparison, predict the diffusion coefficient of methane (CH4) in air under these conditions. About the same as for H2 Smaller than the value for H2 Impossible to predict from the available information. Greater than the value for H2 Which of the following is a correct expression for the convective mass transfer flux? AdeltaC - AdeltaC hm deltaC Which of the following is true of convective mass transfer? It is analogous to heat conduction It is slower than molecular diffusion It requires a concentration gradient It involves a phase boundary The table below shows diffusion coefficients of gases in a large excess of air at 100C. The gases (not in any order) are: sulphur hexafluoride (SF6), argon (Ar), helium (He), methane ( CH4 ), hydrogen (H2 ), carbon monoxide (CO) and carbon dioxide (CO2) Which gas is most likely carbon dioxide? [5) [3] [6] [4] [2] [] [7] The table below shows diffusion coefficients of gases in a large excess of air at 100C, The gases (not in any order) are: sulphur hexafluoride (SFo), argon (Ar), helium (He), methane (CH4), hydrogen (H2), carbon monoxide (CO) and carbon dioxide (CO2) Which gas is most likely sulphur hexafluoride? [1] [7] (3) [6] [2] [5] Oxygen is flowing through a 15m long pipe with radius 10cm. The concentration of O2 at the ends are 25kg/m3 and 5kg/m3. The diffusion coefficient for O2 in air under the prevailing conditions is 2.0105m2/s. Calculate the diffusion flow rate (kg/s) How much O2 (in g ) will flow in 15min ? The diffusion coefficient of hydrogen (H2) in air is D=0.63104m2/s at 293K and 1atm. By comparison, predict the diffusion coefficient of methane (CH4) in air under these conditions. About the same as for H2 Smaller than the value for H2 Impossible to predict from the available information. Greater than the value for H2 Which of the following is a correct expression for the convective mass transfer flux? AdeltaC - AdeltaC hm deltaC Which of the following is true of convective mass transfer? It is analogous to heat conduction It is slower than molecular diffusion It requires a concentration gradient It involves a phase boundary The table below shows diffusion coefficients of gases in a large excess of air at 100C. The gases (not in any order) are: sulphur hexafluoride (SF6), argon (Ar), helium (He), methane ( CH4 ), hydrogen (H2 ), carbon monoxide (CO) and carbon dioxide (CO2) Which gas is most likely carbon dioxide? [5) [3] [6] [4] [2] [] [7] The table below shows diffusion coefficients of gases in a large excess of air at 100C, The gases (not in any order) are: sulphur hexafluoride (SFo), argon (Ar), helium (He), methane (CH4), hydrogen (H2), carbon monoxide (CO) and carbon dioxide (CO2) Which gas is most likely sulphur hexafluoride? [1] [7] (3) [6] [2] [5] Oxygen is flowing through a 15m long pipe with radius 10cm. The concentration of O2 at the ends are 25kg/m3 and 5kg/m3. The diffusion coefficient for O2 in air under the prevailing conditions is 2.0105m2/s. Calculate the diffusion flow rate (kg/s) How much O2 (in g ) will flow in 15min