What is the fraction of surface atoms in a golden sphere with a 1 cm radius? avogadro number - 6-1023 atomic weight of gold - 197 density of gold 19.3 g/cm

Which of these statements best explains why space exploration should be encouraged? it prepares humans to live without oxygen. it dispel myths about objects in space. it prevents comets and asteroids from striking earth. it creates technology to absorb harmful radiations in space.

How many formula units in 2.63 mols of nacl?

You dissolve 8.65 grams of lead(l) nitrate in water and then you add 2 50 grams of aluminum. this reaction occurs 2ai(s)+ 3pb(no3)2(aq) -3pb(s)+ 2aino3la(aq) the theoretical yield of solid lead?