Stoichiometry - transferable mole values?

In summary, to find the mass of HCl produced in this reaction, one must first calculate the number of moles of H3PO4 produced using its formula weight. Then, using the mole ratio in the given chemical equation, the number of moles of HCl can be calculated. Finally, the mass of HCl can be determined by calculating its formula weight and using it to convert the number of moles to grams.
  • #1
skierboy
10
0

Homework Statement



I have to find the mass of HCl (in grams) that is produced given the below reaction yields 18.7g of H3PO4.

Homework Equations



PCl5 + 4H20 -> H3PO4 + 5HCl

The Attempt at a Solution



I calculated the # of mols for H3PO4.

I want to confirm if this mol value (0.190815119mol) is also the # of mol of H and # of mol of Cl, with regrards to HCl.. or is the number of mols of each of H and Cl fives times that of 0.190815119mol because of the coefficient "5"HCl ?

Thanks!
 
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  • #2
Calculate formula weight of phosphoric acid; use this to find moles of phosphoric acid.
Use stoichiometric mole ratio found in the reaction statement to calculate moles of resulting HCl.
Calculate formula weight of HCl and use this to calculate the mass of HCl.
 
  • #3
The chemical equation says that for each mole of PCl5 consumed you get 5 moles of HCl, so you would need to multiply 0.191 mol by 5 to get the number of moles of HCl.
 
  • #4
Alrighty, thanks for the clarification!
 

FAQ: Stoichiometry - transferable mole values?

1. What is stoichiometry and why is it important in chemistry?

Stoichiometry is the study of the quantitative relationships between substances in a chemical reaction. It is important because it allows us to predict the amount of products formed in a reaction, as well as the amount of reactants needed for a desired outcome.

2. What are transferable mole values in stoichiometry?

Transferable mole values refer to the coefficients of a balanced chemical equation, which represent the number of moles of each substance involved in the reaction.

3. How do you calculate transferable mole values?

To calculate transferable mole values, you need to first balance the chemical equation. Then, you can use the coefficients in the balanced equation to determine the mole ratios between reactants and products.

4. How is stoichiometry applied in real-life situations?

Stoichiometry is applied in various industries, such as pharmaceuticals, agriculture, and manufacturing. It is used to determine the amount of reactants needed for a specific product, as well as to ensure the purity and efficiency of the reaction.

5. Can stoichiometry be used to predict the outcome of any chemical reaction?

No, stoichiometry can only be used for reactions that follow the law of conservation of mass. This means that the total mass of the reactants must equal the total mass of the products. Reactions that involve nuclear changes or phase changes cannot be predicted using stoichiometry.

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