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The standard enthalpy of formation of Zn^2+ (aq) is -153.9kJ/mole. How much heat is evolved when 0.3724 g of Zn(s) reacts with excess hydrochloric acid?
Calculate the molecular weight of a polymer if a 100 mL solution of 6.5 grams of the polymer in toluene has an osmotic pressure of 0.044 atm at 27 celsius
Draw the Lewis structure and shape for the ammonia, NH3. Which of the following statements are correct. VSEPR Choose at least one answer. a. There are 8 valence electrons. b. There are 10 valence electrons.
Molecules which are polar overall exhibit a property called a dipole moment. Which of the following possesses polar bonds but has no dipole moment
write a balance chemical equation for the combustion of 1 mol glycerin, and calculate delta H for this reaction at 298K if burning 1.24g of glycerin has a delta E of -54.6 kj
Does caffeine or chlorophyll have a higher Rf value? Briefly explain why by discussing the intermolecular forces present in the molecules
How many kilograms of hydrogen would be required to generate the electricity needed for a typical house? Assume the home uses about 850 kWh of electricity per month,
Consider a steel containing 0.6% carbon and 10% chromium. Estimate the eutectoid temperature and concentration. What is the proeutectoid phase
Gives what happens at neutral pH for aluminum hydroxide. A) Al dissolves B) Al(H2O)63+ dissolves C) Al(OH)3 precipitates D) Al(H2O)2(OH)4- dissolves
Calculate the equilibrium concentrations of the 4 gases: Equation: CO(g)+H2O(g)=> CO2(g)+H2(g) Kc=0.58@100degrees Celsius Using the ICE table might help but I have trouble with that alot
Calculate the potential of the following cell and indicate whether the reaction is expected to be spontaneous. Cr + 3 Ag+ ---> Cr3+ + 3Ag
Difluoromethane gas (CHF2) was placed in a 5.0 litre cylinder at 1.3 bar at 25 C. What is the mass of CHF2
Decide whether or not the metal K dissolves in 1 M HCl. For this metal, if it does dissolve, write a balanced redox reaction showing what happens when the metal dissolves.
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