The molar heat capacity of ethane is represented in the temperature range 298 k to 400 k by the empirical expression coin uk moll 14.73 + (0.1272 mt in k). the corresponding expressions for c and hziai are given in the back of the atkins textbook. calculate the standard enthalpy of formation of ethane at 373k from its value at 298 k, in kj moll

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:

practical process described pest part of scientific investigation.

because practical knowledge is powerful then therotical knowledge.

answer; natural resources;

what is the average time it took the car to travel 0.25 meters?

⇒ 2.23 seconds

what is the average time it took the car to travel 0.50 meters?

⇒ 3.13 seconds