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If we use the reaction Sulphuric Acid with Sodium Hydroxide. The reaction equation is
H2SO4 + 2NaOH = Na2SO4 + 2H2O
Note the molar ratios are 1:2::1:2
However if we have say 75 grams sulphuric acid. what masses are required by sodium hydroxide to make the reaction go to completion. Also what masses of sodium sulphate and water will produce.
First we calculate the moles of H2SO4 . To do this we find the atomic masses.
H x 2 = 1 x 2 = 2
S x 1 = 32 x 1 = 32
O x 4 = 16 x 4 = 64
2 + 32 + 64 = 98
So moles(H2SO4) = 75 / 98 = 0.7653moles ( equivalent to one(1) ratio).
Hence moles (NaOH) = 0.7653 x 2 = 1.5306 ( equivalent to two(2) ratios)
Hence masses of NaOH required for complete reaction is
mass(g) = 1.5306 x (23 + 16 + 1) = 61.44 g.
So total mass of reactants is 75 + 61.44 = 136.44. g
As per the Law of conservation of Mass , the total mass of the products will be 136.44 g. This figure has to be apportioined for the product masses.
Since there are two moles of water produced , then mass of water is
Mass(H2O) =1.5306 x 18) = 27.5508 g
Hence mass of sodium sulphate is 136.44 - 27.5508n = 108.892 g
To verfiy this
First calculate the Relative Molecular mass of Na2SO4
which is
Na x 2 = 23 x 2 = 46
S x 1 = 32 x 1 = 32
O x 4 = 16 x 4 = 64
46 + 32 + 64 = 142
Mass(Na2SO4) = 0.7653 x 142 = 108.67 g ~ 108.892g
The difference in these figures is due to estimations, and calculator errors.
Hopefully you can see ,what stoichiometry is all about. !!!!!
What else can I help you with?
How is stoichiometry used to calculate amount of product from amount of reactant?
The coefficients give the ratio of moles reactant to moles product.
How is stoichiometry used to calculate the amount of product produced?
Stoichiometry relates moles of reactant to moles of product, so if you have the amount of reactant in the equation, you can calculate the amount of product produced.
Is AgNO3 as the limited reactant or NaCl?
To determine the limiting reactant between AgNO3 and NaCl, you need to compare their stoichiometry in the reaction. Calculate the amount of product that can be formed from each reactant using stoichiometry. The reactant that produces the least amount of product is the limiting reactant.
Why does the amount of product formed is directly proportional to the amount of limiting reactant used?
The amount of product formed is directly proportional to the amount of limiting reactant used because the limiting reactant determines the maximum amount of product that can be produced in a chemical reaction. Any excess reactant beyond the limiting reactant will not contribute to the formation of additional product. Thus, the amount of product formed is dictated by the amount of limiting reactant available.
How does a limiting reagent affect how much product is formed?
The amount of product will be limited by the number of moles of the limitin... reagent.
How is stoichiometry used to calculate amount of product from amount of reactant?
The coefficients give the ratio of moles reactant to moles product.
How is stoichiometry used to calculate the amount of product produced?
Stoichiometry relates moles of reactant to moles of product, so if you have the amount of reactant in the equation, you can calculate the amount of product produced.
Is AgNO3 as the limited reactant or NaCl?
To determine the limiting reactant between AgNO3 and NaCl, you need to compare their stoichiometry in the reaction. Calculate the amount of product that can be formed from each reactant using stoichiometry. The reactant that produces the least amount of product is the limiting reactant.
How do you figure out the limited reagent?
To find the limiting reagent in a chemical reaction, you calculate the amount of product that each reactant can produce. The reactant that produces the least amount of product is the limiting reagent. You can then use this information to determine the amount of product that can be formed in the reaction.
Why does the amount of product formed is directly proportional to the amount of limiting reactant used?
The amount of product formed is directly proportional to the amount of limiting reactant used because the limiting reactant determines the maximum amount of product that can be produced in a chemical reaction. Any excess reactant beyond the limiting reactant will not contribute to the formation of additional product. Thus, the amount of product formed is dictated by the amount of limiting reactant available.
How does a limiting reagent affect how much product is formed?
The amount of product will be limited by the number of moles of the limitin... reagent.
How do you determine the limiting agent and excess?
The limiting agent in a chemical reaction is the reactant that is completely consumed first, stopping the reaction. To determine the limiting agent, calculate the amount of product each reactant can produce and identify the one that produces the least amount of product. The other reactant is then in excess.
How is the stoichiometry used to calculate amount of product from amount of reactant?
Stoichiometry allows us to determine the relationship between the amounts of reactants and products in a chemical reaction based on the balanced chemical equation. By using the stoichiometric coefficients of the reactants and products, we can calculate the theoretical amount of product that will be produced from a given amount of reactant using the mole ratio.
What reactant gives the lowest yield by limiting the amount of product?
A reactant that gives the lowest yield by limiting the amount of product is called a limiting reactant. The limiting reactant will run out, so that only a limited amount of product can be made from the reactants.
What is limiting reactant and how control the amount of product formed?
The limiting reactant is that reactant in a chemical reaction that will be used up first. Put another way, it is the reactant that is in the smallest supply. The way it controls the amount of product formed is that once it is used up, no more product can be formed, so the amount of product formed ultimately depends on the amount of the limiting reactant.
How do you do excess problems in stoichiometry?
To address excess problems in stoichiometry, start by determining the limiting reactant based on given quantities. Then calculate the amount of product formed from this limiting reactant. Next, subtract this amount from the excess reactant quantity to find the remaining excess reactant. Finally, determine if there is any new product formed from the excess reactant.
What is the definetions of limiting reactant in chemistery?
In a chemical reaction the limiting reactant is the reactant that there is the least of in the reaction; it determines the amount of product formed. In a chemical reaction it is the reactant that gets completely "used up"
