A sample of waste from a nuclear reactor contains an unnatural distribution of i

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A sample of waste from a nuclear reactor contains an unnatural distribution of isotopes of uranium. 1I5U (atomic mass 235.0439 amu) is 85.30% and 238U (atomic mass 238.0508 amu) is the remainder. What would be the average atomic mass of uranium in this sample? 236 236.1 235.5 236.50 236.8579 A CHE 107 student adds 0.100 L of 0.200 M Pb(NO3)2 (aq) to 0.100 L of 0.200 M Nal (aq) and collects the precipitate Pbl2 (s) (molar mass 461.0) by filtration. The weight of the Pbl2 after drying is 4.52 g. What is the percent yield of the reaction? Pb(NO3)2 + 2 Nal(aq) rightarrow 2 NaNO3(aq) + PbL2 (s) 0.980% 9S.0% 0.490% 49.0% 4.90% How many mL of a 0.500 M solution of Na2SO4(aq) would be required to dilute with water to make 0.100 L of0.250 M Na'(aq) (that, is a solution containing 0.250 M sodium ion)? 0.0250 mL 0.0500 mL 50.0 mL 25.0 mL 0.0125 mL How many atoms of oxygen are in 1.0 g of Mg(NO3)2 (MW 14S.3 g/mol)? 8. lxlO21 2.4x10" 4.1xl0:i 1.2x10222.4xl0lv If the empirical formula of an organic compound is CH and if it is determined that 0.216 g of this compound is equivalent to 0.002074 mole, what is the molecular formula of this compound? C8Hs C4H4 C6H6 CK.H10 C7H7

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