Can someone help me with these chemistry questions?

What causes most sediment to wash or fall into a river

Mercury turns to vapor at 629.88 k how much heat is lost 175 g of mercury vapor at 650 current condenses to a liquid at 297 ca mercury turns to weber at 629.88 kelvin how much he is lost 175 g of mercury vapor and 650 coming condensers to liquidate 297 kevin

Calculate the concentration of all species in a 0.165 m solution of h2co3.