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A student studies the rate at which aspiring decomposes by reaction. she weighs out 58.5 mg of aspirin and dissolves it, making 10ml solution of water. she heats the solution for 5 minutes at 90 C and finds that about 10% of the aspiring is converted to salicyclic acid and acetic acid, How many moles of aspirin are in the initial solution? what is the molarity of aspirin? MM=180g what is the rate of reaction?
You obtain the following six measurements for the mass of water delivered by a special calibrated volumetric pipette
One beaker contains 10.0 mL of acetic acid/sodium acetate buffer at maximum buffer capacity (equal concentrations of acetic acid and sodium acetate), and another contains 10.0 mL of pure water.
A 350.0 mL sample of oxygen gas was collected over water at a temperature of 25.0ºC and 740.0 mm Hg. How many moles of gas were there in this sample if the vapor pressure of water at 25.0ºC is 23.8 mm Hg?
The [OH-] = 1.3 x 10^ -6 M for a 0.025 M solution of a weak base. Calculate the value of Kb for this weak base.
Carbon and silicon belong to the same group and are known to have similar properties
How much water must be added to 534. mL of 0.180 M HCl to produce a 0.135 M solution? (Assume that the volumes are additive.)
For a solution having .0025 equivalents/liter total alkalinity (contributions from HCO3-, CO3-- and OH- (hydroxide)) at [H+] = 4.69E-11, what is the percentage contribution to alkalinity from CO3--?
Explain why does ATP synthesis occur in the presence of Rotenone ( an inhibitor of one the reactions in the electron transport system.) if succinate is combined but not ATP synthesis doesn't occur if L-malate is added?
A chemist prepares a solution by dissolving 4.168 g of NaNO3 in enough water to make 200 mL of solution. What molar concentration of sodium nitrate should appear on the label.
Calculate the internal energy change (deltaU) for vaporization of 100 g of Cl2(liq.) at this temperature and 1 bar? (b) Calculate its molar entropy change (AS) for vaporization at this condition
how many moles of glucose, C6H12O6 can be burned when 60.0 mol of O2 is available?
If 3.1 mol of ethane (C2H6) undergo combustion according to the unbalanced equation C2H6 + O2 ->CO2 + H2O, how much oxygen is required?
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