JEE Main 2021 Chemistry question

The reaction that occurs in a breath analyser, a device used to determine the alcohol level in a person's blood stream is 2K_2Cr_2O_7+8H_2SO_4+3C_2H_5OH\to2Cr_2(SO_4)_3+3C_2H_4O_2+2K_2SO_4+11H_2O If the rate of appearance of is 2.67 mol at a particular time, the rate of disappearance of O at the same time is mol . (Nearest integer)