Calcule a concentração de NaCl (cloreto de sódio) existente em um SF 0,9% 500ml pfv me ajudem não consigo entender de forma alguma​

What is the mass defect of a mole of nuclei with 1.8 x 10^15 j/mol binding energy?

Scientists often have to deal with numbers that are either very large or very small. for example, the radius of the sun is approximately 696,000 kilometers, while bacterial cells are as small as 1.9 × 10-4 millimeters. express each number in an alternate form.

Which change will decrease the number of effective collisions during a chemical reaction? a. adding a catalyst b. increasing the surface area c. decreasing the temperature d. increasing the reactant concentrations e. increasing the volume of the reactants