1. There are how many mol of oxygen in 3.5 mol of caffeine.

7 mol

Explanation:

Caffeine molecular formula C8H10N4O2. It has 2 atoms of oxygen.

                          C8H10N4O2         - 2O

                           1 mol                        2 mol

                           3.5 mol                    x mol

x = 3.5*2/1 = 7 mol

air

in a tire you fill a tire with air

then a couple days later you check the air pressure in the tire

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