For a batch process with a chemical reaction. the differential material balance during the time period when the reaction is happening is given by the equation(dm/dt=rate of accumulation, mgeneration =rate of generation , mconsumption=rate of consuption,minput=rate of input,moutput=rate of output)

a.dm/dt = minput-moutput

b.dm/dt = minput - mconsumption

c.dm/dt = mgeneration-mconsumption

d.dm/dt = moutput - mgeneration