I got the total but can’t get these ???

Can someone me with questions 15 to 17 plz.

Use the periodic table to determine how many grams of oxygen would be required to react completely with 859.0 g c2h2

The goal of this experiment was to answer the question "what is the effect of a gas' temperature on its volume? " you formulated the hypothesis below. hypothesis: if a fixed amount of gas is heated, then the volume will increase because the heat will cause the molecules of gas to move faster and further apart. to test this hypothesis, you changed the of the gas between 0 and 100°c (273 and 373 k) and calculated the resulting of the gas.