Einstein formula for energy-mass conversion.

Solar energy reaches the earth at a rate of about 1400 W/m^2 of surface perpendicular to the direction to the sun. By how much does the mass of sun decrease in each second?

Angular momentum quantization of electrons in a hydrogen atom.

Show that angular momentum quantization of an electron in a hydrogen atom is the necessary consequence of de Broglie's matter wave concept.

Relativity : Calculating the rest mass of an electron. Solution attachment in pdf format.

The rest mass of the electron is 9.11 x 10 ^-31 kg. In a particle accelerator, it has a speed of 0.900c. What is its mass?

Calculating moles and molecular mass in a gas law problem.

A steel bottle of 4.00 liters, initially evacuated, is filled with 4.00 grams of a pure gas. The bottle has an absolute pressure of 1.5375 Standard Atmospheres when the temperature is 300 Kelvin. R=0.0820 liter atm/mole K. 1) How many moles of gas does the bottle contain? 2) What's the molecular weight (in grams) of the mass? 3) If the gas is a hydrocarbon compound known to be a member of the paraffin series, CnH2n+2, what is the chemical formula of the compound?

Working with pressure and Dalton's Atomic Theory.

Hydrogen gas is contained in a one-liter vessel at "STP"(0 degrees Celsius and 1 Std. Atm.). Flourine gas is contained in a second one-liter vessel at the same conditions of temperature and pressure. Then the two gases are forced into the same one-liter vessel, find: 1) The pressure in this vessel before reaction occurs (based on Dalton's Law of Partial Pressures). 2) By means of a spark, a reaction is initiated. After the reaction, the vessel contains no un-reacted Hydrogen or Flourine. Eventually, the temperature of the resulting gaseous product returns to 0 degrees C, but the pressure is measured to be exactly 2.0 Standard Atmospheres. How must the volume of the chamber contain... click for more