QUESTION 3 An experiment uses 2.35g of oxygen, O. Determine the number of moles of oxygen used in the experiment. Report your answer to three significant fores QUESTION 4 A student needs to mentre 0.262 moles of carbon Determine the mass in grans for the needed moles of carbon to the significant figure QUESTIONS An element consists of 2 hotopes and Y) with masses of 4:43 amu and 45 97 respectively. The average mass of the element is 443 amu. Determine the abundance of Isotope X for this element Report your answer as a percentage with significantes QUESTION 6 A sample contains 3.75 moles of glucose CH1206. Determine the number of carbon atoms in this sample. Report your answer soentic notation with 3 significant pres. For example, 1.23_1045 should be entered as 1.23845