please solve and explain properly , thank you.

Q1. Why do onions make us ery? The chemical behind our tears when chopping onions is syn-propiocthialsoxide (C3H6OS,MW:90g/mol). Since syn-propanethial-S-oxide is a volatile sulphur compound. it diffues casily into the air. When syn-propanethial-S-oxide reacts with tears, sulfuric acid is formed. As a result of the irritation of the eye by the sulfuric acid, the eye begins to release more tears to clean the foreign rubrances. Considering the distance between the onion and your eyes is 50cm. calculate the mean speed and costact time of syn-propanethial-S-oxide with your eyes at room temperature. Q2. A sample consisting of 2 mol of perfect gas molecules, initially at Pl=111kPa and T1=277K, is hated reversibly to 356K at constant volume. Calculate the final pressure, U,q, and w.Cva=(52)R Q3. One mole of a perfect gas at 300K is reversibly and isothermally compressed from a volume of 25L. a volume of 10L. Constant temperature is maintained by use of a thermal reservoir at 300K. Cakalate tim sotromy chanvein sucroundines