A 1,000 mL flask contains 4.5 grams of oxygen and 1.75 grams of CO2 at 35C. What is the partial pressure of oxygen? NEED THIS ASAP

Why is it important for scientists to review and repeat the work of other scientists? 1.a scientific theory must be tested three times before it is proven. 2.the scientific method only applies to repeated experiments. 3.an experiment may have had errors that the scientists didn't recognize. 4.the results of individual scientists may be influenced by bias. 5.an experiment must be performed twice before the data can be analyzed.