The combustion of ethane
(
C
2
H
6
)
produces carbon dioxide and steam.

2
C
2
H
6
(
g
)
+
7
O
2
(
g
)
⟶
4
CO
2
(
g
)
+
6
H
2
O
(
g
)
How many moles of
CO
2
are produced when
5.05
mol
of ethane is burned in an excess of oxygen?

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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56 moles of   lieter in chemistry

fe 55.85 g/mol and h2o 18.02 g/mol.