1) Find the concentration of a solution containing 300g of NaCl and 2L of water.
a) First find the molar mass of NaCl using a periodic table.
b) Convert 300g of NaCl into Mols of NaCl
c) Divide the Mols of solute by 2L, the liters of solution.

What is driving behind plate tectonics (plate movment)? a) gravity only b) inertia c) convection and gravity d) the sun theres no option for science so i picked chemistry. plz

The content of manganese (mn) in steel was determined spectrophotometrically and with the use of the standard addition method. an unknown sample of mn from a digested steel sample gave an absorbance of 0.185 when analyzed spectrophotometrically. when 5.00 ml of solution containing 95.5 ppm mn was added to 50.0 ml of the unknown steel solution (digested sample), the absorbance was 0.248. calculate the concentration, in parts-per-million (ppm), of mn in the digested steel sample solution.

As changes in energy levels of electrons increase, the frequencies of atomic line spectra they emit