Water (density = 62.4 lb/ft3, viscosity 1 cp) is pumped from a large reservoir on the floor at a rate of 80 gpm to the top of a small tower. the discharge point is 20 ft above the centerline of the pump. frictional and other (contraction, expansion, etc.) loses in suction and discharge lines amount to 1.5 ft head of liquid. if the pump develops only hp and the inside diameter of the pipe is 2 inches, the water height [ft] in the reservoir must be closest to: (c) 10.18 (d) 12.17 (c) 8.65 (d) 3.11 ie

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:

in 1783 cavendish was working with his hydrogen gas and found that when he burned it and condensed the vapor it was water. this was very significant since it disproved the greek theory of elements completely since water was not a simple substance but the product of two gases. it was lavoisier who hearing of the experiment gave cavendish's gas the name hydrogen ("water-producer") and added that hydrogen burned by combining with oxygen and that water was a hydrogen-oxygen combination.

explanation:

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