Calculate the mass in grams of NaOH required to make up a 1.57 M aqueous solution in a 25.0 mL volumetric flask.
The molar mass of NaOH is 40.0 g/mol.
Give your answer to three significant figures.

Which of the following statements is true about energy quantization at the atomic level? electrons in the outermost orbits are the most stable. electrons in all the orbits around the nucleus have the same amount of energy. electrons in the orbit closest to the nucleus have the least amount of energy. electrons absorb or release the same amount of energy independent of the energy levels.