Please help it's really easy

How many grams of co(g) are there in 74.5 ml of the gas at 0.933 atm and 30o c?

What is the molar mass of potassium nitrate, kno3

Question 3(multiple choice worth 4 points) (04.04 lc) what does it mean when an element is reduced? it empties a valance shell, reducing its atomic radius. it gains electrons, reducing its overall charge. it increases electronegativity, reducing its ability to bond. it loses electrons, reducing its electron number.