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5.00g of Mg was reacted completely with Cl2 to form MgCl2 and 63.0kJ of heat was evolved. what is the molar enthalpy of formation of MgCl2?
Estimate the vapor pressure of sea water at 20 degrees celsius given that the vapor pressure of pure water is 2.338 kPa at that temperature
A sample of 1.42 g of Helium and an unweighed quantity of Oxygen are mixed in a flask at room temperature. The partial pressure of Helium is 42.5 torr and of oxygen is 158 torr.
You have a 48.9 g sample of water at the temperature of -60.0 degrees celcius. How much energy is required to: a) heat the ice to 0 degrees celcius
how many moles of C3H8 need to react to release 5280 kJ of energy?
A student is presented with a sample of an unknown substance and asked to classify the substance as organic or inorganic
Aspirin's mode of action is to make a covalent bond with the active site of the COX II enzyme which inactivates the enzyme. A nucleophilic histidine side chain
how many moles are present of an ideal gas at the following conditions: 1.0 atm, 25.0 C, and occupying 22.4 L, The Lewis structure for PF3 shows that the central phosphorus atom has _______ nonbonding and
what weigh tof CaCO3 is required to completely react 135 ml of a 0.665M solution. Must show set up.
The lengths of chemical bonds in H2 and in other compounds formed from hydrogen isotops is about .74 x 10^-10 m. Estimate the bond length in molecules where the muon replaces the electron.
Which of the following acid-base pairs would work best for a laboratory experiment requiring a pH of 6.8? What molar ratios of the compounds would you use to prepare the solution?
Calculate the pH of a buffer made with 0.50M phosphoric acid and 0.75M sodium dihydrogenphosphate. Ka = 7.5 x 10-3.
If the copper is drawn into wire whose diameter is 8.50 mm , how many feet of copper can be obtained from the ingot? The density of copper is 8.94 g/cm^3 .
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