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8. An element X has two major isotopes: X451 and X458. The isotope mass of X451 is 449.34517u and the average mass of X is 453.74901u. What is the isotope mass of X 458 if isotope X451 has 271.05% abundance? ( 15 points) 458449.3451720571.051=00.7105+2 9. Chlorophyll, the green pigmentation in plants that allows them to absorb sunlight and convert it to energy, has the formula Css5H2MgN4O5. Answer the following: ( 16 points) a. What is the molar mass of chlorophyll? ( 3 points) No mot shres b. What mass in grams of nitrogen is present in 8.31mol of chlorophyll? (4 points) 8.31mol1mu14.m1N=t21= c. What number of magnesium atoms is present in 831 mol of chlorophyIl? (5 points) D.31mot chlorophyil 1m0424,3 d. What is the mass in grams of 5.091017 molecules of chlorophyll? (4 points) 10. Jadeite is the nare mineral source of "true jade". Jadeite crymali have a mass percentage of 9.952%6 sodium, 24.18% iron, 24.32% alicon, and 41.56%6 onyeen. What in the cmpinical formula for jadeite? (20 points) 9.952%Nax22.99Na1mole=0.4329Na24.18%Fe55.851male=0.4334fe24.32%5N=2.7141.56%N15.001.015=0 11. Synthetic polymers are an important class of compound, including metbyl acrylate, the base component of Plexiglass. If the formula for methyl acrylate is CH1O2, determine the following ( 8 points) a. What is the molar mass of acrylic acid? ( 2 points) No me phun b. What are the mass percentages of Earbon hydrogen, and bxygen in methyl acrylate? ( 6 points, 2 points each)