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Homework Help for Chemistry

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Chemistry

In an experiment, potassium chlorate decomposed according to the following chemical equation. KClO3 → KCl + O2 (Molar mass of KClO3 = 122.5 g/mol; KCl = 74.55 g/mol; O2 = 31.998 g/mol) If the mass of potassium chlorate was 240 grams, which of the following calculations can be used to determine the mass of oxygen gas formed?

 

Answered
22 May
Chemistry

a 1l flask is charged with a mixture 0.200 mol NOBr, 0.20 mol Br2 and 0.40 mol NO and warmed up to 50c. when the reaction has come to equilibrium, the flask is found to contain 0.166 mol NOBr. based on these results, what is the value of Kc for this reaction under these conditions?

 

Answered
22 May
Chemistry

Calculate the amount of heat needed to boil  31.5g of methanol (CH3OH), beginning from a temperature of 49.1°C. Be sure your answer has a unit symbol and the correct number of significant digits.

 

 

Answered
21 May
Chemistry

A 50.0 mL aliquot of solution containing 0.450 g of MgSO4 (MW=120.37 g/mole) in 0.500 L required 37.6 mL of EDTA solution for titration. How many milligrams of CaCO3 (MW=100.09 g/mole) will react with 1.00 mL of this EDTA solution?

 

Answered
21 May
Chemistry

What is the hydronium ion concentration in a solution prepared by mixing 50.00 mL of 0.10 M HCN with 50.00 mL of 0.020 M NaCN? Assume that the volumes of the solutions are additive and that K a = What is the hydronium ion concentration in a solution prepared by mixing 50.00 mL of 0.10 M HCN with 50.00 mL of 0.020 M NaCN? Assume that the volumes of the solutions are additive and that K a = 7.0 × 10-6 M

 

Answered
20 May
Chemistry
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Answered
20 May
Chemistry

H. Write the balanced chemical equation for the reaction of acetic anhydride with water

 

Answered
20 May
Chemistry

What amount of Al2O3 is produced from the reaction of 3.0 mol Al with 2.0 mol Fe2O3?

 

Answered
19 May
Chemistry

A student wants to prepare 200 mL of a 0.300 M HCl(aq) solution by diluting a 5.00 M HCl(aq) solution. What volume of 5.00 M HCl(aq) should the student use?

 

Answered
18 May
Chemistry

calculate H3o+ in a solution that is at 25 C and has [OH-] = 6.7 x 10-2 M. Is the solution neutral, acidic or basic?

 

Answered
18 May
Chemistry

Q1) chemist has to titrate an acid with a molecular formula containing only carbon, hydrogen, and oxygen with the respective percentages: 53.66% (C), 4.09% (H) and 42.25% (O) by mass. To reach the equivalence point the chemist used 18.02 mL of NaOH solution 0.0406 (M) to neutralize 0.3602 g of this acid. Assuming that the acid is monoprotic (there is only one acidic hydrogen per molecule of acid): 1. Calculate the number of mole of acid used in the titration. 2. What is the empirical formula of the acid? 3. What is the molecular formula of the acid? 

Q2) In an experiment 26.0 g of powdered iron (III) oxide is mixed with 3g carbon and heated to 500°C in a rigid 6.0 L reactor. The following reaction occurred:     

                      

Assume that the reaction is 100% complete, the volume of Fe(s) and C(s) is small enough to be ignored, and the temperature of the reactor is maintained at 500 °C.

  1. Write the balanced reaction.
  2. Calculate the number of moles of gas formed.
  3. What will be the pressure of the gas in the reactor after the reaction?

 

 

Answered
18 May
Chemistry

Methane burns in the presence of O2 to produce carbon dioxide and water vapor. If 2.50 L of methane is burned in an open container at STP, what volume of O2 is required for complete combustion? What volumes of carbon dioxide and water vapor would be produced?

 

Answered
18 May
Chemistry

Calcium hydride (CaH2) reacts with water to form hydrogen gas: CaH2 (s) + H2O (l) -------- Ca (OH) 2 (ac) + 2 H2 (g) How many grams of CaH2 are required to produce 48.0 L of gaseous Hydrogen at 32.0 degrees C. and 0.888 atm.

Answered
13 May
Chemistry

How many molecules of H2O comprise 2.07 miles

Answered
12 May
Chemistry

At the molecular level, how would the helium atoms be affected if you put the balloons in the trunk of your car on a hot summer day?

Answered
11 May
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