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An atom of 125Sn has a mass of 124.907785 amu. Calculate the mass defect (deficit) in amu/atom. Use the masses: mass of 1H atom = 1.007825 amu mass of a neutron = 1.008665 amu 1 amu = 931.5 MeV
the two most popular types of fuel for fuel cells are hydrogen and methane or natural gas. while hydrogen fuel cells
some ice cubes at 0 degrees c with a total mass of 379g are placed in a microwave oven and subjected to 750. w 750.
The pH of a 0.010 mol L-1 solution of a weak monoprotic acid is 2.09 at 25oC. What is the pKa for this acid
For a solution that is 0.282 M NH3 and 0.117 M NH4NO3, calculate the following. For NH3, Kb is 1.8x10-5. Enter [OH?] and [H3O+] with two significant digits. Enter scientific notation as 1.23E4.
the intermediates formed in the base catalyzed cleavage of D-fructose to dihydroxyacetone and D-glyceraldehyde.
N2O2 draw valence bond drawings for the resonance forms-clearly labeling the sigma and pi bonds and hybrid orbitals.
Lithium oxide is an effective absorber of carbon dioxide and can be used to purify air in confined areas such as space vehicles.
What is the vapor pressure in mmHg of a solution prepared by dissolving 5.00g of benzoic acid (C7H6O2) in 100g of ethyl alcohol (C2H6O) at 35 C?
At 1.00 atm and 0 °C, a 5.04 L mixture of methane (CH4) and propane (C3H8) was burned, producing 18.0 g of CO2. What was the mole fraction of each gas in the mixture? Assume complete combustion.
A buffer that contains 0.55 M base, B, and 0.30 M of its conjugate acid, BH+, has a pH of 8.94. What is the pH after 0.0020 mol HCl is added to 0.25 L of this solution.
The calorimeter temperature rises 0.42°C. The calorimeter and water have a combined heat capacity of 32.16 kJ/K. Calculate the heat of formation of ammonia, ?H°f, in kJ/mol. The formation reaction for ammonia is: 0.5N2(g) + 1.5H2(g) ? NH3(g).
What is the mass percent of MgO in the mixture? Assume that only the MgO reacts with CO2.
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