# Questions tagged [stoichiometry]

Stoichiometry refers to the relationship between the amounts of substances of the reactants and the amount of substances of the formed products. This tag should be used for specific questions about chemical reaction equations.

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### Preparation of potassium cyanide from potassium ferrocyanide via HCN method

Do anyone have any experience with mentioned method? (I did some math and gonna proceed eventually, any advise would be welcomed) I have acces to well equipped lab, respirator with filter rated for ...
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### Walk Me Through This Problem Please [closed]

1) Calculate the number of grams of Fe that are produced when 57 grams of FeO is reacted with excess aluminum in the following reaction: 2Al(s) + 3FeO(s) -> 3Fe(s) + Al₂O₃(s) 2) Calculate the number ...
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### Question on chemical equilibrium [closed]

8 moles of so2 and 4 moles of O2 are mixed in a closed vessel.the reaction proceeds at constant temperature. By the moment when equilibrium sets in,80% of the initial amount of so2 enters into the ...
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### Concentration terms [closed]

Can you please help me with this question 0.5g of an iron wire was dissolved in 75ml of H2SO4 solution ; and the volume was increased to 250ml with water. 25ml of this solution reduced 85ml of N/10 ...
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### What masses of ethanol and ethanoic acid would need to be reacted together to give 1.00 g of ethyl ethanoate? [closed]

I need assistance with this question. If it would be possible to provide the working out too, it would be more beneficial. Thanks.
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### Can someone help me find the limting reagent? [closed]

Okay, so for home work i was given this problem. Suppose that 8.00g of CH4 reacts with 16.00g O2 to form CO2 and H2O, find the grams of CH4, H2o, and O2 left over Balanced Equation : CH4 + 2O2 = ...
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### How many grams of Crystalline Na2S need to prepare Na2SO4? [closed]

Question: Determine what mass of crystalline Na2S, H2SO4 solution w = 10.5% and water you need to take to prepare a solution of sodium sulfate weighing 200 g, w(Na2SO4) = 14.2% I have translated this ...
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### How to deal with the unit “Coulomb per equivalent”? [duplicate]

In a question that I came across they defined $1\,\pu{F}$ as 96500 coulomb per equivalent. Now as far as my knowledge is concerned $1\,\pu{F} = 96500\,\pu{C/mol}$. The question involved asks to ...
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### If 40.0 grams of Aluminum and 25.0 gram of Cl2 reacted together how much AlCl3 can be produced? [closed]

The equation goes as follows: Al + Cl2 ----> AlCl3. The equation is unbalanced so I then balanced the equation. Heres what I did: 2Al + 3Cl2 ---> 2AlCl3 I then got the Molar mass of 40 g of Aluminum....
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### Why Molecular Solids can be treated as Monoatomic in Reactions

I'm trying to figure out what is the precise rule for the formula of elemental substances in reactions. I'm afraid I can't word the question properly, so I'll try to give some examples. 1)Oxidation ...
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### What did Richter mean regarding an acid base reaction?

Recently I've been reviewing concepts belonging to the history of chemistry. But I came stuck at trying to understand a passage which I read from wikipedia entry (and which it seems has been mentioned ...
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### Indicators of Cu(I) or Cu(II)

We performed an experiment in class where we placed a piece of copper wire in a solution of silver nitrate, we were tasked with predicted the mass of copper that should react and the mass of silver ...
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### Stoichiometry Limiting Reagent and Mass of One of the Products

0.3 g of ethanoic acid (CH3COOH) reacts with a solution of containing 0.00450 moles of sodium hydrogencarbonate. (I'm not so sure what is missing in the question after "of" in solution of containing) ...
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### Question On Balancing [closed]

I recently worked on a lab which involved the following reaction: $$\ce{HCl(aq) + CuO(s) -> CuCl2(aq) + H2O(l)}$$ In my description of the reaction I wrote the following "The equation shown ...
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### Calculate the mass of iron in the original mixture!

I seemingly can't solve the following problem, I've spend over 30 mins on it, no progress, can any of you geniusses give a step by step solution to me? Thank you so much Problem: A mixture of ...
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### Finding molecular formula with limited information given

I have recently stumbled upon a question I can't seem to solve : Chlorine can also be used to synthesise a bromine-containing oxoanion that is mainly used in continuous or batch dyeing processes. ...
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### Does it make a difference to use moles, grams or liters to find the required mass of an element from a reaction with water vapor?

I'm confused if the required mass from a two step reaction can be found using moles, grams or liters. This happened when attempting to solve a gas reaction with a solid. The problem is as follows: ...
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### How does the vapor pressure in a vessel affects the total pressure after a combustion reaction?

The problem is as follows: A sealed container of $3\,L$ in capactity is filled with hydrogen and oxygen at $314\,torr$ each one at a temperature of $27^{\circ}C$. A spark produces the reaction ...
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### How to calculate the relationship between the pressures of zinc, carbon monoxide, and carbon dioxide based on mole balance?

Zinc oxide is reduced at a constant temperature in a closed reactor using $\ce{ZnO(s)}$ and $\ce{C(s)}$ as the only starting materials. The following reactions are assumed to be at thermodynamic ...
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### How do you find the heat capacity ratio of combustion products?

For example, if gaseous oxygen $(O_2)$ and paraffin wax $(C_{32}H_{66})$ were to stoichiometrically combust at STP, how would one go about finding the heat capacity ratio ($\gamma={c_p \over c_v}$) of ...
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### Why do we need to use oxidation number in order to balance a complex chemical reaction easily in an acidic or alkaline medium? [closed]

I have been trying to balance this chemical reaction in an "acidic" medium without using oxidation number or ion electron method: [$\ce{Fe^2+ + Cr2O7^2- -> Cr^3+ + Fe^3+}$]. Though I can balance ...
A mixture of $\ce{NH3}$ and $\ce{N2H4}$ is placed in a sealed container at $\pu{300 K}$. The pressure within the the container is $\pu{0.6 atm}$. The container is heated to $\pu{1000 K}$ where the ...