In 1961 the mlar atomic mass of carbon 12 was defined to be exactly 12g/mol (a value agreed upon by chemists and physicists) and the molar atomic masses of all the elements were re-evaluated according to this new standard. this made the re-evaluated molar mass of oxygen-16 become 15.994915g/mol. avogadro's number is defined as the number of atoms in the molar atomic mass of an element. the present accpted value for avogadros' number is 6.0221367x10^23/mol. what was the value o avogadro's number used by physicists before 1961? .

What are the factors that affect the resistance of a wire?

Steam is generated in a boiler of a cogeneration plant at 10 mpa and 450°c at a steady rate of 5 kg/s. in normal operation, steam expands in a turbine to a pressure of 0.5 mpa and is then routed to the process heater, where it supplies the process heat. steam leaves the process heater as a saturated liquid and is pumped to the boiler pressure. in this mode, no steam passes through a condenser, which operates at 20 kpa. (a) determine the power produced in the turbine and the rate at which process heat is supplied in this mode. (b) determine the power produced in the turbine and the rate of process heat supplied if only 60 percent of the steam is routed to the process heater and the remainder is expanded to the condenser pressure. (3.32 mw; 9.69 mw; 4.25 mw; 5.82 mw)

The coefficient of friction is a number that represents the resistance to sliding between two in contact with one another.