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When 1.00 L of water from the surface of the Dead Sea is evaporated, 179 g of MgCl2 is recovered. What is the molarity of MgCl2 in the original sample?
What is the mol fraction Na2SO4 in a solution which is 11.5% by weight Na2SO4 (molar mass Na2SO4 = 142.06 g/mol and H2O = 18.016 g/mol)?
Fluorine-18, which has a half-life of 110 min, is used in PET scans. If 123 mg of fluorine-18 is shipped at 8:00 a.m., how many milligrams of the radioisotope are still active if the sample arrives at the radiology laboratory at 1:30 p.m.?
What amount of energy would be released upon formation of a mole of 28Si nuclei from their subatomic particles?
A mixture of 0.100 mol of CO2, 0.050 mol of H2, and 0.100 mol of H2O is placed in a 1.00 L vessel and reacts according to the reaction shown below.
If an aqueous solution has a hydroxide ion concentration ([OH-]) of 5.94 x 10-5 mol/L, what is the hydronium ion concentration? 4.48 x 10-12 mol/L 1.68 x 10-10 mol
Calculate the molality of potassium iodide. Assume that the density of water is 1.000 g/mL. Please show all calculations in solving the problem
A student is presented with a sample of an unknown substance and asked to classify the substance as organic or inorganic
Give the quantitative species inventory for the system which ultimately results from mixing 2.55mols Cl2, 1.20mols Br2, 1.25mols I2,
The charges of the ions in an ionic compound affect the strength of the electrostatic attraction holding that compound together. Based on ion charges, rank these ionic compounds by their expected melting points.
When heated, lithium reacts with nitrogen to form lithium nitride: 6Li(s) +N2(g) → 2Li3N(s)
A particular reactant decomposes with a half-life of 145 s when its initial concentration is 0.389 M. The same reactant decomposes with a half-life
Suppose that the observed melting point range of a solid was originally 150-160 °C, but this became 145-145.5 °C after recrystallization. How might you account for this observation
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