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1.a sample of pure calcium fluoride with a mass of 15.0 g contains 7.70 g of calcium. how much calcium is contained in 40.0 g of calcium fluoride? 2.silver has two isotopes. one isotope contains 60 neutrons and has a percent abundance of 51.839% the other contains 62 neutrons. give the atomic symbols for the two isotopes.3.what is the average atomic weight of silver? what is the mass (in grams) of a single chlorine molecule? 4.how many moles of ethanol (ch_3ch_2oh) are in 141 mg?
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Chemistry, 23.06.2019 05:30
For the reaction i2(g)+br2(g)←−→2ibr(g), kc=280 at 150 ∘c. suppose that 0.450 mol ibr in a 2.00-l flask is allowed to reach equilibrium at 150 ∘c. what is the equilibrium concentration of 2ibr, i2, br2
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Chemistry, 23.06.2019 09:00
A0.10 m aqueous solution of sodium sulfate is a better conductor of electricity than a 0.10 m aqueous solution of sodium chloride. which of the following best explains this observation? (a) sodium sulfate is more soluble in water than sodium chloride. (b) sodium sulfate has a higher molar mass than sodium chloride. (c) to prepare a given volume of 0.10 m solution, the mass of sodium sulfate needed is more than twice the mass of sodium chloride needed. (d) more moles of ions are present in a given volume of 0.10 m sodium sulfate than in the same volume of 0.10 m sodium chloride. (e) the degree of dissociation of sodium sulfate in solution is significantly greater than that of sodium chloride.
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1.a sample of pure calcium fluoride with a mass of 15.0 g contains 7.70 g of calcium. how much calci...
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