If 2.1 moles of cacl2 are dissolved in enough water to make a 0.92-liter solution, what is the resulting molarity? . answer . . . . a) 2.3 m cacl2. b) 0.44 m cacl2. c) 0.70 m cacl2. d) 3.0 m cacl2 .

The crust of earth may a- continets and ocean floors. b-continents only. c-layers of sedimentary rocks and continents. d-all of the above

Which function is performed by earths atmosphere? a. ultraviolet rays are prevented from reaching the ozone layer. b. earths temperature is raised and moderated by trapping in heat c. charged particles from the sun are prevented from reaching earth. d. magnetic charges from space are prevented from reaching earths surface.

Given sno2 + 2h2 - sn + 2h20 tin oxide reacts with hydrogen to produce tin and water. how many moles of sno2 are needed to produce 500.0 grams of sn?