Agas in a container with a fixed volume was originally at a pressure of 316 kpa and a temperature of 154 k
what is the new pressure in atm if the temperature is increased to 235 k?

482.2 kPa.

Explanation:

∵ P α T.

∴ P₁T₂ = P₂T₁.

P₁ = 316.0 kPa, T₁ = 154.0 K.

P₂ = ??? kPa, T₂ = 235.0 K.

∴ P₂ = (P₁T₂)/T₁ = (316.0 kPa)(235.0 K)/(154.0 K) = 482.2 kPa.

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: