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Question 1 (Essay Worth 5 points)Use complete sentences to explain how you determined the mass of oxygen in the compound produced in the virtual lab and how the mass of each element can be used to determine the empirical formula of the compound.Question 2 (Multiple Choice Worth 3 points)Which of the following pairs does not share the same empirical formula? C2H6 and C4H12 C3H6O3 and C2H4O2 C3H8O and CH2O C2H8 and CH4Question 3 (Multiple Choice Worth 3 points)How many moles of oxygen are in 1 mole of Ca(NO3)2? 2 3 6 8Question 4 (Essay Worth 4 points)What is the molar mass of Mn(ClO3)2? Explain how you calculated this value.Question 5 (Essay Worth 5 points)A compound made of two elements iridium (Ir) and oxygen (O) was produced in a lab by heating iridium while exposed to air. The following data was collected:Mass of crucible: 38.26 gMass of crucible and iridium: 39.52 gMass of crucible and iridium oxide: 39.73 gShow or explain your calculations as you determine the empirical formula of the compound.Question 6 (Essay Worth 5 points)The empirical formula of a compound is determined to be CH and its molecular mass is found to be 78.06 g/mol. Determine the molecular formula of the compound showing your work.

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