376 Answered Questions for the topic stoichiometry

Stoichiometry Chemistry

04/07/18

Can someone help me with percent yield homework? And if you could explain, that'd be amazing! I'm really stuck

Consider the reaction: 4 NH3 + 5 O2 → 4 NO + 6 H2OIf the reaction has 29.8% yield, how many grams of NH3 should react with excess oxygen to produce 70.5 g of NO?

How to calculate the mass-relationship?

I have difficulties figuring out how to calculate the mass-relationship between N and P in ammoniumphosphat (NH4)3PO4? Is it 1:1?
Stoichiometry Chemistry

03/29/18

Chemistry stoichiometry

Using stoichiometry, calculate the volume of O2 gas at 1.25 atm and 18.0 ̊C, which forms when 10.5g KClO3 decomposes according to the reaction:2KClO3--> 2KCl + 3O2 Potentially useful... more
Stoichiometry Chemistry

03/28/18

Chemistry help

Metal sulfites, such as Na2SO3, also react with HCl to produce a gas than escapes from the reaction mixture. For example: Na2SO3+ 2 HCl -->2 NaCl + H2O + SO2(g)   Which reaction below would... more
Stoichiometry Chemistry

03/28/18

Chemistry help

True or false? If 1.0 g of NaHCO3 and 1.0 g of Na2CO3 were to each react with excess HCl, both reactions would produce identical masses of CO2(g).
Stoichiometry Chemistry

03/28/18

Chemistry help

3. A metal carbonate containing an unknown +2 metal ("MCO3") reacts with excess acid resulting in the loss of CO2. Analysis of the experimental data indicates that the mass % CO2 in the unknown... more
Stoichiometry Chemistry

03/28/18

Chemistry help

Zinc(II) carbonate, ZnCO3, has a theoretical mass % CO2 of 35%. If 1.00 g of ZnCO3 reacts with excess HCl according to the procedure in this experiment, what mass of CO2 is lost as the ZnCO3 and... more
Stoichiometry Chemistry

03/28/18

Chemistry help

The exact mass of NaHCO3 that was weighed was 0.75g. The mass lost in the reaction was found to be 0.42 g. Calculate the experimental mass % CO2 in this solid.
Stoichiometry

03/21/18

When 266.53 grams of Bi2O3 react with excess of C, how many moles of Bi form?

i need help i am somewhat confused
Stoichiometry

03/18/18

2c2h6+7o2=4co2+6h2o in the combustion of ethane how many moles of co2 can be produced from 1.00 mole of C2H6

I have no idea how to do that!
Stoichiometry

03/16/18

converting molecules to total atoms

If I had 0.234mol of H2O, I was able to convert that into 4.22g and 1.41e23 molecules, which were both correct. But I wasn't able to calculate the number of total atoms in the sample. Isn't it just... more
Stoichiometry

03/15/18

If there are 12 pesos in a dollar and 70 yen in a dollar. how many pesos are in ¥100

I need to know the word behind the question 
Stoichiometry

03/15/18

what is the mass of the potassium nitrate precipitate produced?

Potassium hydroxide in solution is reacted with 64.2 g of copper (ii) nitrate in this double replacement reaction producing potassium nitrate and copper (ii) hydroxide
Stoichiometry Chemistry Combustion

03/14/18

Use this information to calculate the molecule formula for the compound

Nicotine is composed of carbon, hydrogen and nitrogen and its molar mass is about 160g/mol. When 4.38mg of the compound burns completely in oxygen, the reaction produces 11.9mg of gaseous... more
Stoichiometry

02/22/18

how many moles of aluminum are needed to form 18.06 x 10^23 formulas units of Al2O3

4 Al(s) + 3 O2 (g) = 2 Al2O3(s)
Stoichiometry

02/18/18

How many moles of CO2 are present in the flask after 4mL of HCl have been added? What is the stoichiometric ratio between HCl adn CO2?

Flask is 150mL. P=1.81atm. Gas volume=135.9ml. Liquid volume=14.1mL.  I need help with putting this into an equation and writing the balanced equation for sodium bicarbonate and HCl.
Stoichiometry Math Chemistry Helpful

02/03/18

2KClO3 —> 2KCl + 3O2

How many grams of KClO3 are required to produce 62 moles of KCl?
Stoichiometry

02/02/18

Determine the limiting reactant if 17.5 g Zn and 27.5 g MnO2 are used. Determine the mass of Zn(OH)2 produced.

 I really need help finding the mass. So I included the previous masses.
Stoichiometry

01/26/18

For the balanced equation shown below, how many grams of iron(III) oxide will be produced by 634 grams of iron(II) sulfide?

This is stoichiometry and it asks for the mass, in grams, of iron (iii) oxide. This question is really hard and it takes a lot of work. Please answer.
Stoichiometry

01/10/18

Helpppppppppp

Nicotine is a compound that contains C,H,N If a sample 2.50 g is burned in oxygen, 6.78 g CO2, 1.94 g H2O and 0.432 g N2 are the products of combustion. What is the percent coumpound of nicotine?
Stoichiometry Science Chemistry

01/02/18

What volume of oxygen, o2, at stp can be prepared by the complete decomposition of 0.100 mol of potassium chlorate kclo3? 2kclo3=2kcl+3o2

I need help on this question. I would like work to help me figure out the problem.
Stoichiometry

12/18/17

A 150 ml solution of 0.75 M HBr(aq) acid is bolied evaporating the water reducing the solution down to 85 ml

a explain what would happen to concentration of solution  b explain how you would expect the ph to change
Stoichiometry

12/05/17

how many moles of CO2 are formed from 25.0 moles C2H2

5C2H2(g) + 2O(g)= 4Co(g) + 2H2O
Stoichiometry

12/03/17

Consider the reaction between HCl and O2: 4HCl(g)+O2(g)→2H2O(l)+2Cl2(g) When 63.1 g of HCl are allowed to react with 17.2 g of O2, 46.1 g of Cl2 are collected.

A. Determine the limiting reactant for the reaction.Express your answer as a chemical formula.   B. Determine the theoretical yield of Cl2 for the reaction.   C. Determine the percent yield for... more
Stoichiometry Chemistry

11/22/17

What is the maximum mass of ethane (C₂H₄) that can react with 100.0dm3 of oxygen in a combustion reaction? (Assume STP Condition)

I need help with the following question:What is the maximum mass of ethane (C₂H₄) that can react with 100.0dm3 of oxygen in a combustion reaction? (Assume STP Condition)This is a question I got as... more

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