I believe the correct answer from the choices listed above is the third option. Water is necessary for living organisms because all <span>organisms need water to transport chemicals into their cells. Hope this answers the question. Have a nice day.</span>
Molar mass of sodium chloride is 22.99 g/mol (Na+) + 35.45 g/mol (Cl-) = x g/mol. Then take the mass of sodium chloride sample 5 grams and divide by molar mass to get the number of moles. Take this number and multiply it by Avogadro’s number (6.22*10^23 molecules/mol). You now have the amount of molecules in 5 grams of NaCl.
A substance floats or sinks in another because of its relative density. Take ice floating in water for example. Water is more dense than ice so ice floats.
Mass is incorrect as the buoyancy or ability of an object to float depends on the mass per volume, which is equivalent to density.
