* 1. The change in length of a metal with initial length lo, Coefficient of Linear expansion a and exposed
to change in temperature of AT, is given by:
A. AL = al. AT
B. AL = a / 1.AT
C. AL = al./AT
2. Which law of thermodynamics that states that: If body "A" is in thermal equilibrium with
D. AL = 1/al. AT

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:

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