How many 50.0 foot cars are in a long freight train traveling at 40.0 mph if it takes the entire train 55.0 seconds to pass a crossing?
[ Chemistry ] Open Question : In a UV-Vis experiment, four blank measurements had an average absorbance of 0/0404 AU and a standard deviation of 9.75×10^-4 AU.?
If the limit of the linearity of the instrument is 4.00 AU, what is the dynamic range?
how many atoms are contained in a cubic grain of salt (NaCl) that is 1 mm on each side. The density of NaCl is 2160 kg/m3. Remember that the atomic weight is the mass of Avogadro’s number of atoms, where No= 6.02 x 10^23.