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Copper has two naturally occurring isotopes. Cu-63 has a mass of 62.939 amu and relative abundance of 69.17%. Use the atomic weight of copper to determine the mass of the other copper isotope. Express your answer using four significant figures
Certain metal cations can act as Lewis acids in water to produce an acidic solution even though the metal ion contains no hydrogen ions at all.
Calculate the concentration of bicarbonate ion, HCO3 -, in a 0.010 M H2CO3 solution that has the step wise dissociation constants Ka1 = 4.3 × 10-7 and Ka2 = 5.6 × 10-11.
What is the molarity of a solution when 38.8g of potassium chromate (K2CrO4 ) is dissolved in enough water to make 3 liters of solution
A hot air balloon is inflated to its full extent by heating the air inside it. In the final stages of this process the volume of the balloon changes from 4.00 x 10^6 L to 4.50 x 10^6 L by addition of 1.3 x 10^8 J of energy as heat.
The weight of the product (Hexaphenylbenzene) for this part of the reaction was 2.04 g. What is the percentage yield? What is the overall percent recovery for the three step process?
What mass of HClO4 should be present in 0.600 L of solution to obtain a solution with a pH of 2.50?
The enthalpy change for the reaction of hydrogen gas with flourine gas to produce hydrogen flouride is -542kJ fo the equation as written H2+F2=2HF deltaH=-542kJ
an undergraduate researcher in a biology lab produced a buffer solution by dissolving sodium dihydrogen phosphate (Ka = 6.2 × 10-8) and sodium hydrogen phosphate (Ka = 3.6 × 10-13) together in an aqueous solution. What mole ratio of Na2HPO4/NaH2PO..
calculate the concentration in mol/L and mg/L of a solution prepared by adding 4.00 mL of a 8.26 x 10^-4M stock solution of Allura Red to a 100.00 mL volumetric flask and then filling to the mark with DI water.
What is the percent yield of lithium nitride if 76.8 g of lithium nitride is recovered from reacting 56.0 g of nitrogen gas with 56.90 g of lithium metal?
Lyzozyme(The protein) unfolds at a transition temperature of 75.5 degree celsius, the standard enthalpy of transition = 509 kJ/mol. Compute the entropy of unfolding of this protein at the temperature of twenty five degree celsius
The question in the lab is asking what percentage by mass is the calcium, chloride and water in the orginal solution for each trial. In this lab we performed two trials, in each, we added 50 mL water to 2.0 g of CaCl2.
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