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when a gold nugget with a mass of 521 g is added to 50.0 ml of water the water level rises to 77 ml what is the density of gold
Given a restriction enzyme that has a concentration of 50 units/ml but your experiment requires that the concentration be reduced to 2.5 units/ml.
calculate the mass, in grams, at 25 degrees celcius of 30.0mL of propylene glycol, which has a density of 1.036g/mL
Calculate the molarity of a solution made by dissolving 0.0715 mol Na2SO4 in enough water to form exactly 550. mL of solution
Determine the pH of a 0.227 M C5H5N solution at 25°C. The Kb of C5H5N is 1.7 x 10-9.
A .10M solution of the weak acid HCN has an equilibrium constant of 4.9 X 10^-10. Calculate the percent dissociation of the acid
What mass of this substance must evaporate in order to freeze 160 g of water initially at 19 C? (The heat of fusion of water is 334 {J/g}; the specific heat of water is 4.18 {J/g c. K}.)
If 3.1 mol of ethane (C2H6) undergo combustion according to the unbalanced equation C2H6 + O2 ->CO2 + H2O, how much oxygen is required?
A buffer solution is prepared by mixing 0.500 L of 1.50 M HF and 0.400 L of 0.95M KF. What is the pH of this buffer? [Ka(HF) = 6.30 × 10-4]
potassiumm chlorate (KClO3) decomposes to form potassium chloride and oxygen gas. if 5.4 moles of potassium chlorate decompose, how many moles of oxygen could be produce.
Consider a binary liquid mixture A and B, where A is volatile and B is nonvolatile. The composition of the solution in terms of mole fraction is xA = 0.045 and xB = 0.955
An element has two isotopes with masses of 62.9396 u and 64.9278 u,and 30.83% of the atoms are the heavier isotope. Calculate the atomic mass of this element and give its name and symbol.
At a particular temperature, K 3.75 for the reaction SO2(g) + NO2(g) SO3(g) + NO(g) If all four gases had initial concentrations of 0.800 M
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