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The half life of 90Sr is 29.1 y. If a sample initially contains 50.00 g of 90Sr, how much 90Sr remains after 58.2y?
A student mixes 78.9 g of water at 66.5°C with 65.1 g of water at 30.1°C in an insulated flask. What is the final temperature of the combined water?
converting liquid water to solid ice releases 1.44 kcal/mol.
If 20 moles G2 (random element) are reacted with 10 moles B2 (random element) , how many moles of G2B will be formed
Determine How many moles each of Na+ and Cl- are in 0.800 L A physiological saline solution contains 172mEq/ L each of Na+ and Cl-of the saline solution?
Draw the product obtained when trans-3-octene is treated first with Br2 in CH2Cl2, second with NaNH2 in NH3
Suppose that, from measurements in a microscope, you determine that a certain bacterium covers an area
a patient needs to take 625 of ibuprofen twice daily. the pills in the bottle are each 250. . how many pills does the
If 29.8 mL of 0.102 M acid with a Ka of 0.000015 is titrated with 0.107 M NaOH solution, what is the pH of the titration mixture at halfway to the equivalence point?
Bromine is extracted from brine wells. The process involves treating water containing bromine ion with chlorine gas and extracting the Br2 from the solution using an organic solvent. Write a net ionic balanced equation for the reaction of chlorine..
Cyclopropane gas is 85.7 % C and 14.3 % C H by mass and has a density of 1.71 g/L at 755 mm Hg and 25C. a) What is the molar mass of cyclopropane. b) What is the chemical formula for cyclopropane
Compute KP at this temperature If the pH of an aqueous solution is 8.23, what are the hydrogen- and hydroxide-ion concentrations of this solution?
1.when we say that something gives us energy what does that mean? what is a biological definition of energy?nbsp2.what
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