From mass to moles There are two unknowns in this problem - the grams of potassium carbonates and the grams of sodium carbonate (we only know the combined grams). Let's designate the grams of potassium carbonate as our first unknown (you may want to call it gKcarb, or x, some other variable name that makes sense to you) and the grams of sodium carbonate as our second unknown (you may want to call it gNacarb, or y, some other variable name that makes sense to you). Set up an equation for the sum of your two unknowns. Starting with 'unknown' grams of potassium carbonate, use stoichiometry to calculate the number of moles of nitric acid that would react with the potassium carbonate. Your answer will have a variable for your unknown grams of potassium carbonate in it. Starting with 'unknown' grams of sodium carbonate, use stoichiometry to calculate the number of moles of nitric acid that would react with the sodium carbonate. Your answer will have a variable for your unknown grams of sodium carbonate in it. Set up an equation for what you get if you add these two quantities. You should now have two equations (sum of your masses, and sum of moles of acid) and two unknowns! solve your system of equations for the mass of potassium carbonate and the mass of sodium carbonate. mass potassium carbonate (x) g mass sodium carbonate (y) g Evaluate

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Q: How many molecules are in the sample? 87 g CCl4 Express your answer using two significant figures.

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Q: three

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Q: The unknown compound is 28.6% C rbon does a 100.0 gram sample of

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Q: Calculate the mass, in grams, of 322 atoms of iron, Fe (1 mol of Fe has a mass of 55.85 g).

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Mole Concept

Mole concept is a method to determine the amount of any substance that consists of some elemental particles using a grouping unit called ‘mole’. The mole concept enables one to handle the large amount of small elementary particles. The mole concept can be used in many calculations related to mole calculation, molar amount, mole ratio, and so on, which are significant in chemistry.