The reaction that occurs in a 'breathlyser', a device used to determine the alcohol level in a person's blood stream, is :

$\begin{array}{l}2{\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7+8{\mathrm{H}}_2{\mathrm{SO}}_4+3{\mathrm{C}}_2{\mathrm{H}}_5\mathrm{OH}⟶\\ 2{\mathrm{Cr}}_2{\left({\mathrm{SO}}_4\right)}_3+2{\mathrm{K}}_2{\mathrm{SO}}_4+3{\mathrm{CH}}_3\mathrm{COOH}+11{\mathrm{H}}_2\mathrm{O}\end{array}$

If the rate of disappearance of ethanol is 6.9 gm/min, then the rate of appearance of chromium(III) sulphate is 

: (Cr= 52)