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Chemistry
Page 9
Questions (98,004)
When 84.8 g of iron(III) oxide reacts with an excess of carbon monoxide, iron is produced.
Fe2O3(s) + 3CO(g) ==> 2Fe(s) + 3CO2(g)
7 answers
asked by
Kim
8,510 views
what is the Ka for ethylammonium cation,C2H5NH3^+, at 25 celsius?(Kb for C2H5NH2=4.7x10^-4 at 25 Celsius)
5 answers
asked by
Bb
5,337 views
help me..
The pKa of acetic acid, HC2H3O2, is 4.76. A buffer solution was made using an unspecified amount of acetic acid and
4 answers
asked by
Azy
3,071 views
1)) The following two half-cells are paired up in a voltaic cell. How will lowering the pH affect the E of the overall cell?
C
5 answers
asked by
Val
1,062 views
2. What is the reduction half-reaction for the following unbalanced redox equation?
Cr2O72– + NH4+ Cr2O3 + N2 A.) Cr2O3 ->
5 answers
asked by
jack
5,881 views
Which of the following gases would be most likely to experience ideal behavior at high pressures?
a. F2 b. Ne c. C2H6 I think the
5 answers
asked by
Christine
2,182 views
You have the following acids and their conjugate bases available:
Acetic Acid: CH 3COOH/CH3COO-; Ka = 1.8 × 10-5 Carbonic Acid:
7 answers
asked by
Christine
2,302 views
Identify each enthalpy change by name and classify each change as exothermic or endothermic.
a)1 mol C3H8 (l) ==> 1 mol C3H8 (g)
5 answers
asked by
Sal
3,799 views
In the chemical reaction where N2O4(g) is converted to 2NO2(g), if 0.5 M N2O4 and 0.15 M NO2 are present in the vessel, is the
5 answers
asked by
Christine
2,664 views
For the equilibrium H2(g)+CO2(g)<-->H2O(g)+CO(g)
Kc=3.18 at 1106 K.If each of the four species was initially present at a
9 answers
asked by
Andy
2,967 views
Is potassium citrate ionic compound or molecular compound?
4 answers
asked by
Melissa
3,011 views
The standard enthalpy of combustion of C2H6O(l) is -1,367 kJ mol-1 at 298 K. What is the standard enthalpy of formation of
4 answers
asked by
abby
4,391 views
Calculate the volume of CO2 that would be produced from 0.5 mole of Fe2O3 according to the
5 answers
asked by
Joy
1,479 views
How many molecules are in 15g CH4? How do you figure this out?
4 answers
asked by
Lauren K.
1,289 views
Which statement describes the quantities that can be found using the number of moles? (1 point)
A) It can be used to find the
15 answers
asked by
o
6,885 views
Please tell me if these are right.
How many grams are needed to obtain 1.5 moles of magnesium oxide? I got 60grams is this right?
5 answers
asked by
Jason
1,132 views
Which statement accurately describes what happens in a reaction when reactants become products?(1 point)
Some reactants rearrange
7 answers
asked by
Jadyn
1,685 views
In an experiment, 0.0300 moles each of SO3(g), S02(g), and O2(g) were placed in a 10.0L flask at a certain temperature. When the
4 answers
asked by
Mitch
2,455 views
If 100cm3 of oxygen diffuses through a porous plug at 5cm3/sec how long will it take 200cm3 of methane to diffuse through the
4 answers
asked by
Sulaimon Martins
546 views
Sea water contains an average of 1.08 x 10^3 ppm of Na+ ion. Calculate the molar concentration of Na+ given that the average
4 answers
asked by
marie
6,010 views
What would you expect to see if you performed the chemical reaction shown below? 2H2O2 —> H2O(l) + O2(g)
- solid precipitate
5 answers
asked by
Bri
2,579 views
If sulphur (iv) oxide and methane are released simultaneously at the opposite end of a narrow tube the rate of diffusion Rso2
5 answers
asked by
Brad
1,888 views
2 H2S (g) + SO2 (g) <===> ƒnƒn3 S (s) + 2 H2O (g)
1) At 298 K, the standard enthalpy change, H¢X, for the reaction represented
4 answers
asked by
JJ
2,760 views
For the equilibrium:
CO(g) + H2O(g) ⇌ CO2(g) + H2(g) KC = 10.0 If 1.6 mol of CO and 1.6 mol of water are initially added to a
4 answers
asked by
Potato34
713 views
A commercially available sample of sulphuric acid is 15% H2SO4 by mass (density=1.10g/ml) Calculate the molarity ,normality and
10 answers
asked by
riya
16,577 views
Insoluble silver carbonate, Ag2CO3(s), forms in the following balanced chemical reaction:
2AgNO3(aq) + K2CO3(aq) = Ag2CO3(s) +
6 answers
asked by
Gale
3,232 views
What is the pH of a 0.0344 M KOH solution?
5 answers
asked by
Cassie
1,282 views
Calculate the equivalent mass of each of the following acids.
a) HC2H3O2 b) KHCO3 c) H2SO3
7 answers
asked by
HELP PLEASE
2,688 views
What is the pH of a solution containing 0.81M HA and 0.35M A- ? Ka HA=5.45x10-8.
4 answers
asked by
Leaf02
538 views
Vapour pressure of benzene and toluene are 0.9bar and 0.85bar. 7.8g of benzene is added to 180g of toluene. To find the vapour
4 answers
asked by
Isha
3,694 views
Determine Kc at 298 K for the reaction 1/2 N2(g0 + 1/2 O2(g) + 1/2 Cl2(g)--> NOCl(g), given the following data at 298 K
1/2 N2(g)
4 answers
asked by
Jalisa
1,142 views
Even after twenty years of use, most quarters have the same shiny appearance that they did when they were minted. Most pennies,
4 answers
asked by
Homeworktaker
1,347 views
Fe2O3 + 2Al --> 2Fe + Al2O3
How many grams of Fe will form when 97.6g Al2O3 form? Please & Thank you
3 answers
asked by
Ana
2,560 views
How many atoms of Nitrogen are in 4(NH₄)₂CrO₄ ?
A. 1 B. 2 C. 8 D. 4
3 answers
asked anonymously
101 views
In standardization of potassium tetraoxomaganate VII with ammonium iron II tetraoxosulphate VI , how do you find the molarity of
3 answers
asked by
FE
684 views
1. Calculate the standard enthalpy change for the reaction:
C2H4(g) + H2(g) → C2H6(g) given that the enthalpy of combustion for
4 answers
asked by
John
7,465 views
Hey this is my question:
At a temperature of 300°C and a pressure of 40.5 MPa, 90.0 mol of H2(g) and 80.0 mol of N2(g) are
3 answers
asked by
yo!
1,429 views
What weight of na2co3 of 95% purity would be required to neutralize 45.6ml of 0.235n acid?
I want you step by step clearly
3 answers
asked by
Fai
2,028 views
Which of the following substances would allow an electric current to flow through it easily?(1 point)
Responses aluminum (Al)
1 answer
asked anonymously
66 views
Construct the following diagrams and label them.An electrochemical cell with a salt bridge using copper and zinc electrode and
1 answer
asked by
Asu
36 views
The indicator methyl red has a pKHIn = 4.95. It changes from red to yellow over the pH range from 4.4 to 6.2.
If the indicator is
4 answers
asked by
cp
164 views
on chemical scale, the relative mass of the isotopic mixture of x atoms (x^20,x^21,x^22) is approximately equal to:(x^20 has 99
6 answers
asked by
veer
2,449 views
A 25.0 mL aliquot of vinegar was diluted to 250 mL in a volumetric
flask . Titration of 50 mL aliquot of the diluted solution
4 answers
asked by
reema
2,539 views
Calculate the current that must be passed into a solution of aluminum salt for 1 hours 30 minutes, in order to deposit 1.5g of
5 answers
asked by
Olajide ifeoluwa
877 views
At STP, a 5.00L flask filled with air has a mass of 543.251g. The air in the flask is replaced with another gas and the mass of
5 answers
asked by
Kim
4,014 views
Hydrocarbons A and B both contain 85.7 % carbon. Their molar masses are 42 and 84 respectively.
a) Which elements does a
6 answers
asked by
Amir
3,319 views
If a certain oxide of nitrogen weighing 0.11g gives 56 ml of nitrogen and another oxide of nitrogen weighing 0.15 g gives the
6 answers
asked by
Akashdeep
4,970 views
A 20 g mixture containing 95% (by weight) of A and 5% of B is recrystallized in toluene (b.p. 110 C). Solubility for compound A
7 answers
asked by
Eric
4,482 views
Science
CHECK MY ANSWERS!!!!!!! 1) Cobalt has a mass number of 59 and an atomic number of 27. A student wants to create a model
20 answers
asked by
DrBob222
6,566 views
A buffered solution was created by mixing solutions of NH4Cl and NH3 at 25 C. Which species, NH4+ or NH3, has the highest
4 answers
asked by
Sara
2,424 views
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