If the molar mass of na2s04•nh2o is 304.04g/mol what is the hydration number "n"

1. combine iron and copper (ii) sulfate solution. (hint: iron will form the iron (iii) ion) fe + cuso4 → 2. combine lead (ii) nitrate and potassium iodide solutions. pb(no3)2+ kl → 3. combine magnesium metal and hydrochloric acid solution. mg + hcl → 4. electrolysis (splitting) of water. h2o → 5. burning magnesium. mg + o2 →

At element makes up all organic compounds?

Is 343 in the sequence -5, -2, 1, 4, 7