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How much heat is required to warm 225 g of ice from -46.8°c to 0.0°c,melt the ice, warm the water from 0.0°c to 100.0°c,boil the water , and heat the steam to 173.0°c?
Consider the reaction when aqueous solutions of sodium sulfide and manganese(II) sulfate are combined.
From data below, calculate the total heat (in J) associated with the conversion of 0.412 mol ethanol gas (C2H6O) at 501°C and 1 atm to liquid ethanol at 25.0°C and 1 atm
Hexane has a negligible absorbance above 200nm. S sample of Hexane containing 20.0 mg/L of an aromatic compound (MW=114.3 as impurity had an absorbance value of 0.351 at 254 nm in a 2.00 cm pathlength cuvet
(Assume that each G protein activates a single unique adenylyl cyclase.) Calculate the number of moles of cAMP that are produced per second. Enter your answer to at least two significant figures
When a 30 mL sample of KOH solution is titrated with a standard solution of 0.411 M benzoic acid, it takes 25.5 mL to reach the equivalence point of the titration. What was the original concentration of the base?
A sample of ideal gas at room temperature occupies a volume of 34.0 L at a pressure of 722 torr. If the pressure changes to 3610 torr, with no change in the temperature or moles of gas, what is the new volume, V2
a solution is prepared by dissolving 4.21 g of a nonelectrolyte in 50.0 g of water. If the boiling point increases by 0.203 C what is the molar mass of the solute? The boiling point elevation constant for water is 0.512 C/.
What is the buffer component ratio, ([BrO-]/[HBrO]) of a bromate buffer that has a pH of 7.88. Ka of HBrO is 2.3 x 10-9
A 33.0-g sample of an alloy at 93.0°C is placed into 258 g of water at 22.0°C in an insulated coffee cup. Assume that no heat is absorbed by the cup. If the final temperature of the system is 31.1°C
The intiala rates at various substrate concentrations for an enzyme-catalyzed reaction are as follows.
The NAA used here was purchased from ACME Laboratories as a 10 mg/ml solution. How many grams of NAA are in 100 ml of a 2mg/liter solution
Draw the major and minor resonance structure for the carbonate ion (CO3^-2). Include any formal charges, Indicate which are the major resonance structures and why.
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