It is desired to produce 250 kg/h of steam methanol at 150 ° C and 1 atm from liquid methanol at 25 ° C and 1 atm using a well insulated heat exchanger. As heating fluid, water vapor is used, which feeds the exchanger at 10 bar and 200 ° C and leaves it at 85 ° C and lbar. Calculate the flow of water vapor (in m³/h) that feeds the exchanger. The figure below illustrates the continuous process in steady state.

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