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Assuming that a neutron star has the same density as a neutron (4.0 x 10^14 g/cm3), calculate the mass (in kg) of a small piece of a neutron star the size of a spherical pebble with a radius of 0.20 mm.
how many liters of gasoline would you need to buy to complete a 142- trip in Europe? Use the following conversions
How many Protons, Neutrons, and Electron of 63Li+. What are the mass number and atomic number of each of these atoms
Many scientists and business professionals describe the achievement as a turning point. Provide a summary of what took place during the project and why such activity is significant for us today.
A sample of 0.05567 mole sodium acetate was dissolved into 150.0 mL of water. If 2.00g of NaOH(s) was added to the solution and allowed to dissolve
When aluminum crystalizes, it forms face-centered cubic cells. The atomic radius of an Al atom is 143. Caluculate the density of metallic aluminum.
if a sample of gas is at 2 atm and is at 15 degrees celsius, what would be the new pressure in the gas if the gas is heated to 100 degrees celcius?
Consider the following thermochemical equations : 8Mg(s) + Mg(NO3)2(s) ? Mg3N2(s) + 6MgO(s) ?H°rxn = -3884 kJ Mg3N2(s) ? 3Mg(s) + N2(g) ?H°rxn = +463 kJ 2MgO(s) ? 2Mg(s) + O2(g) ?H°rxn = +1203 kJ Use the above equations to calculate the ?H°f (in k..
A 10.0L container of helium gas with a presure of 250mmHg at 0 degrees Celsius is heated to give a pressure of 1500mmHg. What is the temperature in degrees Celsius?
Determine the maximum number of electrons that can exist in a completely filled n=5 level. Give four possible quantum numbers for a 5f electrons of the hydrogen atom
Calculate the amount of heat lost by the hot water and the heat gained by the cold water. The difference, representing the heat gained by the calorimeter, divided by the corresponding temperature change
Suppose that 1.41 g of impure barium hydroxide is dissolved in enough water to produce 177.1 mL of solution and that 44.1 mL of this solution is titrated to the stoichiometric point
Inhibitors helped to elucidate the electron transport chain. For the conditions below what would happen i) if rotenone were added to a suspension of respiring mitochondria or, ii) if cyanide were added.
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