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Which of the following proves the law of definite proportions?
A. Oxygen is heavier than hydrogenB. As the pressure on oxygen increases, its volume decreasesC. Water is always composed of twice as many hydrogen atoms as oxygen atomsD. A plot of masss verses volume of oxygen produces a hyperbola
The volume of a gas dropped from 300 ml to 280 ml when the original pressure of 200 torr was increased. what was the new pressure in kpa if the temperature is held constant
A manufacturer of bicycles has 4819 wheels, 2305 frames, and 2250 handlebars. How many wheels are left over? How many frames are left over? How many handlebars are left over? Which part limits the production of bicycles?
insulin is a protein that is used by the body to regulate both carbohydrate and fat metabolism. A bottle contains 475 of insulin at a concentration of 30.0 . What is the total mass of insulin in the bottle?
Calculate Gibbs free energy and determine the type of thermodynamic reaction and what type of thermodynamic reaction is shown.
Calculate the molar mass of maltose (which is not an ionic compound). (b) The density of the solution is 1.014 g/mL. Calculate the osmotic pressure of the solution.
A star is 3.28 x 1014 km from Earth. How many days does it take for light to travel from the star to Earth?
What mimimum hydronium ion concentration (M) would be needed to prevent precipitation of cupric hydroxide (Cu(OH)2 Cu2+ + 2OH- , Ksp = 2.2 x 10-20) from a solution containing 0.010 M Cu2+ ion?
What is the pH of a buffer solution that is 0.0100 M in hypochlorous acid, HCIO, and 0.0300 M in sodium hypochlorite, NaCIO? (the Ka for HCIO is 3.5 x 10-8.)
What is the pH of a solution that is 6.5×10-2M in potassium propionate and 8.5×10-2M in propionic acid?
Chemistry The rate of a first-order reaction is followed by spectroscopy, monitoring the absorption of a colored reactant at 520 nm. The reaction occurs in a 1.09-cm sample cell
If 28.0 mL of .150 M HCL is needed to neutralize all the NH3 from a 2.25-g sample of organic material, calculate the mass percentage of nitrogen in the sample.
If One gram (1.5 g) of glyceryl trioleate is completely hydrogenated.How many grams of hydrogen was used in the process.
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