426 Answered Questions for the topic stoichiometry

Stoichiometry Science Chemistry Moles

12/04/18

Mg(s) + 2 HCl(aq) --> MgCl2(aq) + H2(g) how many moles of Mg are there? how many moles of hydrogen gas?

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Stoichiometry

09/18/18

Given the following balanced equation: H3PO4(aq) + 3 KOH(aq) → K3PO4(aq) + 3 H2O(l) How many grams of potassium hydroxide are required to completely neu
Given the following balanced equation:H3PO4(aq) + 3 KOH(aq) → K3PO4(aq) + 3 H2O(l)How many grams of potassium hydroxide are required to completely neutralize 3.70 grams of phosphoric acid?
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Stoichiometry Chemistry

08/28/18

How many molecules (not moles) of NH3 are produced from 1.86×10^−4 g of H2?
I have no idea what I'm doing wrong. "Variables are case sensitive. Check to make sure you are using the correct case." I know that the mol is 6.15X10^-5 mol NH3. Where am I going wrong?
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Stoichiometry

08/18/18

when 50g of methanol fully reacts with excess ethanoic acid,it produces 68.88g c3h6o2 calculate the percentage purity of the methanol
it is a chemistry question and it includes the empirical formula  
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Stoichiometry

08/14/18

How many grams of NO2 are required to produce 7.53 g of HNO3?
formula: NO2(g) + H2O(l) → HNO3(aq) + NO(g)
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Stoichiometry

08/14/18

What mass of zinc is required to produce 2.3 g of hydrogen?
formula: Zn + H2SO4 =  ZnSO4 + H2
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Stoichiometry

08/14/18

If 5.21 g of silver nitrate react with sodium phosphate what mass of silver phosphate is produced.
formula: 3AgNO3 + Na3PO4 → 3NaNO3 + Ag3PO4
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Stoichiometry

08/11/18

given 8CO+17H18-->C8H18+8H2O
in this chemical reaction, how many grams of H2 will react completely with 6.50 moles of CO? express answer to three zignifican figurwz
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07/16/18

Stoicheometry question: Missing step?
I've done this problem but it was wrong. I calculated my limiting reagent, how much Aluminum i need, calculated my theoretical yield. is there a step i'm missing? please show work so i see where i... more
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Stoichiometry

07/14/18

when 68 g of NH3 react with 192 g of O2 then calculate the amount of NO formed (in moles)?
How much NO formed (in moles)
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Stoichiometry Chemistry

06/18/18

Percent purity
A 0.347 g sample of impure NaHSO3 is dissolved in water and titrated with 0.1481 M NaOH. If 20.20 mL of NaOH is required, what is the percentage purity of the NaHSO3 sample?
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Stoichiometry Chemistry

06/13/18

If 50g of Ca(OH)2 (MM=74.1gm/mol) reacts to completion, how many moles of CaCl2 are produced?
 chemistry math
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Stoichiometry Chemistry

06/02/18

How many mL of 0.528 M HCl are needed to dissolve 9.57 g of CaCO3?
How many mL of 0.528 M HCl are needed to dissolve 9.57 g of CaCO3?   2HCl(aq) + CaCO3(s) CaCl2(aq) + H2O(l) + CO2(g)   ________mL
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Stoichiometry Chemistry

06/02/18

How many grams of carbon disulfide are needed
How many grams of carbon disulfide are needed to completely consume 83.6 L of chlorine gas according to the following reaction at 25 °C and 1 atm?   carbon disulfide ( s ) + chlorine ( g ) carbon... more
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Stoichiometry Chemistry

06/02/18

How many grams of Cu(OH)2 will precipitate
How many grams of Cu(OH)2 will precipitate when excess KOH solution is added to 61.0 mL of 0.521 M Cu(NO3)2 solution?   Cu(NO3)2(aq) + 2KOH(aq) Cu(OH)2(s) + 2KNO3(aq)   _______g
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Stoichiometry General Chemistry

05/28/18

A 1.60-g sample of an oxide of bromine is converted to 2.685 g of AgBr. Calculate the empirical formula of the oxide.
Please show work.  Thank you!
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Stoichiometry Chemistry

05/16/18

Percent Yield
Aspirin, C9H8O4 (180.2 g/mol) is prepared by the following reaction:   C7H6O3 + C4H6O3 → C9H8O4 + C2H2O2   If you need to prepare 45 g of aspirin, and the yield for the reaction is 85%, how... more
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Stoichiometry

05/04/18

1 C3H8 + 5 O2® 4 H2O + 3 CO2 32 grams of propane (C3H8) is burned in excess oxygen gas to produce how many grams of water?
a52.4 b26.8 c37.6 d13.7
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Stoichiometry

05/01/18

Determined the mass of carbon dioxide produced in the reaction C2h4+3o2=2co2+2h2o
54.3 grams of ethylene reacts with 150 grams of oxygen gas in combustion reaction to produce carbon dioxide and water
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Stoichiometry

04/29/18

numerical on law of multiple proportion
Copper gives two oxides , on heating 1.0gm of each in hydrogen gas, 0.888gm and 0.799gm of the metals are produced . Show that the results agree with the law of multiple proportion.
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Stoichiometry

04/22/18

Percent yield?
Gaseous butane (CH3(CH2)2CH3) reacts with gaseous oxygen (O2) to produce gaseous carbon dioxide (CO2) and gaseous water (H2O). If 0.256 g of water is produced from the reaction of 1.2 g of butane... more
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Stoichiometry

04/17/18

A solotuion contains 0.60 mg/mL Mn2+. What minimum mass of KIO4 must be added to 5.00 mL of the solution in order to completely oxidize the Mn2+ to MnO4-?
A solotuion contains 0.60 mg/mL Mn2+. What minimum mass of KIO4 must be added to 5.00 mL of the solution in order to completely oxidize the Mn2+ to MnO4-?
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Stoichiometry Chemistry

04/07/18

How do you find the excess reagent?
Consider the reaction: 2 HCl + Ca(OH)2 → 2 H2O + CaCl2Calculate the amount of the excess reagent, in moles, when 2.6 moles of HCl and 1.4 moles of Ca(OH)2 are mixed.
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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?
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03/31/18

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?
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