The molecular weight of h2 and the mass of 1 mole of h2 are a. quantities b. different quantities c. inversely related d. not the same

a. same quantities

Explanation: According to avogadro's law, 1 mole of every substance contains avogadro's number of particles.  

Molecular weight of = 2.0 g/mol

To calculate the moles, we use the equation:

Now 1 mole of molecule contains = of molecules.

Thus both represent same quantities.

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:

c. because step up transformer steps up the input voltage i.e increases the input voltage  

the number of turns are greater on the secondary side of step up transformer  

transformer does not handle dc current