What is the formula mass of calcium sulfate dihydrate [caso4⋅2h2o]?

be sure to add the water of hydration, which is the 2h2o part (water surrounding the calcium sulfate).

136 g/mol

154 g/mol

164 g/mol

172 g/mol

172 is correct

Silver tarnishes as silver metal reacts with hydrogen sulfide, h2s, in the air. in this reaction, dark silver sulfide, au2s, covers the surface of silver. when silver is polished, this coating of silver sulfide can be removed from the surface. this makes the silver shiny again. enter the coefficients that balance the tarnishing reaction equation. (type 1 for no coefficient.)

Which atom or ion is the largest? a. k b. k+ c. ca d. ca2+ e. li

When electrolyzing copper (ll) chloride, what reaction takes place at the anode? what reaction takes place at the cathode?