F23.2 grams of an aqueous solution of nickel(ii) iodide, nii2, contains 5.47 grams of nickel(ii) iodide, what is the percentage by mass of nickel(ii) iodide in the solution?

If the mass of the products measured 120g what would the mass of the reactants a. 30g b. 60g c. 120g d. 240g

The following reaction shows sodium carbonate reacting with calcium hydroxide. na2co3 + ca(oh)2 → naoh + caco3 how many grams of naoh are produced from 20.0 grams of na2co3? (molar mass of na = 22.989 g/mol, c = 12.01 g/mol, o = 15.999 g/mol, ca = 40.078 g/mol, h = 1.008 g/mol) 12.2 grams 15.1 grams 24.4 grams 30.2 grams

Avariable that is not being directly tested during an experiment should be changed varied experimented controlled