Select all the true statements about stoichiometry. You never need to use the molar mass when solving stoichiometry problems.

You always need to determine and use the correct mole ratio when solving a stoichiometry problem.

If your chemical equation isn't balanced, you can just assume all the coefficients are 1 when determining
and using the mole ratios in your solutions.

Using stoichiometry, you can determine the amounts of reactants you need to make the desired amount
of product in a chemical reaction.

If you are given the mass in grams, you must first convert it into moles.

You do not need to convert grams into moles before using the mole ratios in your calculations.

One way in which the useful metal copper is produced is by dissolving the mineral azurite, which contains copper(ii) carbonate, in concentrated sulfuric acid. the sulfuric acid reacts with the copper(ii) carbonate to produce a blue solution of copper(ii) sulfate. scrap iron is then added to this solution, and pure copper metal precipitates out because of the following chemical reaction: (s) (aq) (s) (aq) suppose an industrial quality-control chemist analyzes a sample from a copper processing plant in the following way. he adds powdered iron to a copper(ii) sulfate sample from the plant until no more copper will precipitate. he then washes, dries, and weighs the precipitate, and finds that it has a mass of .