Why would aluminum foil be useful in a thermos design

Explanation:

aluminum foil be useful in a thermos design because Aluminum foil reflects radiating heat.

Aluminum foil acts as insulation serves productively and efficiently and stops the transmission of heat that helps to reduce wastage of heat.

Aluminum foil work as thermal insulation which is utilized for multiple works where it can be useful for preventing unwanted energy gain or energy loss.

Thus this is the reason aluminum foil is useful in a thermos design.

the grams   of   barium that   are in   2.3 x 10^23   atoms of barium   is   52.4 g (answer c)

    calculation

mass = moles   of ba   x molar   mass of ba

  molar mass of ba from periodic table=   137.3 g/mol

  use the   avogadro's law   constant   to   calculate the moles of barium

  that   is     1 mole =   6.02   x 10^23 atoms

                    ? moles = 2.3 x 10^23   atoms

by cross   multiplication

=(1 mole   x 2.3x 10^23 atoms)   / 6.02   x10^23 atoms)=   0.382   moles

mass   is therefore = 137.3   g/mol x 0.382 mol = 52.4 ( answer c)

explanation:

um i think it might be a car?