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Two 20.0-g ice cubes at -21.0 °C are placed into 235 g of water at 25.0 °C. Assuming no energy is transferred to or from the surroundings, calculate the final temperature of the water after all the ice melts.
How many grams of sodium are needed to produce 33.3 L of hydrogen gas according to the following reaction at 25oC and 1 atm. sodium (s) + water (l) -------sodium hydroxide (aq) + hydrogen (g)
Cocaine overdose and addiction are major public health problems. One novel treatment involves the administration of high activity mutants of human butyrylcholinesterase (BChE) (i.e. this would be a protein-based ‘drug') that would hydrolyze and d..
What is the molar mass of X if 0.85g of X depresses the freezing point of 100g of benzene by 0.47Cdegrees?
Determine How much Na2EDTA x 2 H2O must be weighed to form exactly two litres of 0.0500 M solution? FW=372.24
What is the molality of a 25.5% aqueous solution of phosphoric acid, H3PO4 (M = 97.99 g/mol)
The test tube contained some water (besides the metal) that was subsequently added to the calorimeter. Considering a higher specific heat for water, will the temperature change in the calorimeter be higher, lower, or unaffected by this technique e..
A gaseous sample of this element is bombarded by photons of various energies (in these same units). Match each photon to the result of its absorption (or lack thereof) by an n=1 electron.
Solids generally expand as the temperature increases. Such an expansion results from an increase in the bond length between adjacent atoms as the vibrational amplitude increases.
Calculate the net charge of Aspartic Acid. Its given that Aspartic acid has a pK1 COOH at 1.99 and also a pK2 NH3 group at 9.90. PKr Side Chain is 3.90 (COOH) How do i find the net charge?
The atomic mass of element X is 33.42 amu. A 15.05-g sample of X combines with 79.32 g of another element Y to form a compound XY. Calculate the atomic mass of Y.
How long would it take for 1.50 mol of water at 100. 0C to be converted completely into steam if heat were added at a constant rate of 16.0J/s ?
How many grams of patassium chlorate decompose to potassium chloride and 524 mL of O_2 at 128C and 752 torr?
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