10. Which of the following does NOT represent an oxidation - reduction (redox) reaction? a. 3Al(s) + 6HCl(aq) + 3H2(g) + AlCl3(aq) b. Cu(NO3)2(aq) + Zn(s) → Zn(NO3)2(aq) + Cu(s) C. Na2CO3(aq) + 2HCl(aq) → 2NaCl(aq) + H200) + CO2(g) d. 2Nal(aq) + Brz(aq) 2NaBr(aq) + 12(aq)

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:

when atmosphere interacts with biosphere they focuses on on the sources and sinks of green house gases (ghgs) air pollutants, particular matters, water and energy between the earth's surface and the atmosphere. the biosphere affects the climate. the atmosphere and biosphere are in constant interaction with each other, and all living things rely on gases in the atmosphere for life. organisms such as animals take in oxygen gas form the atmosphere to use in every cell of their body for smooth functioning of daily routine exercises.

im not exactly sure but i think its b!

i don't know people like to fight everywhere rip.