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The triangleHfus of ethanol (C2H5OH) is 4.60KJ/mol. How many kilojoules are required to melt 24.5grams of ethanol at its freezing point?
Calculate the difference in pH when 4.01 g of NaClO is added to 364.8 mL of 0.50 M HClO. Ignore any changes in volume.
Consider the combustion reaction between 30.0mL of liquid methanol ( density = 0.850 g/mL) and 15.0L of oxygen gas measured at STP. The products of the reaction are CO2 and H2O
A sample of compound B having an unknown concentration is measured to have an absorbance of .90 in a 1.00 cm path length cell at 500 nm. What is the concentration of B in this sample, assuming Beer's law holds
Hydrogen gas can be prepared by reaction of zinc metal with aqueous HCl. how many liters of H2 would be formed at 770 mm Hg and 16 degrees celcius if 26.5g of zinc was allowed to react
how many moles of sodium hypobromite should be added to 1.00 of 5.0times10-2 hypobromous acid to form a buffer solution
What is the kinetic energy of the emitted electrons when cesium is exposed to UV rays of frequency \rm 1.5\times 10^{15}~Hz
A student measures out 100.0 ml of 1.00 M HCl and places it in a styrofoam cup. The temperature of the HCl is 22.30C. She then addes 1.002 g of MgO to the cup.
a weak acid ha is found to ionize 17.8 when mixed at a concentration of 0.3 moll. what is the value of ka for this
Derive a curve for the titration of 50.00mL of a 0.1000 M solution of Compound A with a 0.2000 M solution of compound B in the following list. For each titration, calculate the pH afterthe addition
What is the pressure (in mmHg) of the gas inside the apparatus below if the atmospheric pressure is Patm=775 mmHg, h1=20 mmHg, and h2=50 mmHg
3.953g of egg shell was reacteed with 50ml of 0.1 mol/l hcl and shel contains ca2co3 after all the sheell reacted resultign solution was placed in a columetric flask and th colume made up to be 100ml.
Calculate the standard enthalpy of formation of liquid water (H2O) using the following thermochemical information
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