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Chemistry
Page 23
Questions (96,853)
Which of the following substances have a standard heat of formation (ÄHf°) of zero?
O2(g) at 25.0 degree C and 1 atm Fe at 1200
5 answers
asked by
Anonymous
23,548 views
Deduce the number of nitrogen atoms in:
5.00 x 10^-3 mol of ammonia, NH3 and 4.601 g of nitrogen dioxide, NO2
6 answers
asked by
Syndra
4,288 views
an antifreeze solution is made by mixing ethylene glycol (density= 1116 kg/m^3) with water. suppose that the specific gravity of
5 answers
asked by
kai
5,987 views
Which of the following acid-base indicators should be used for the titration of NH3 with HBr? Kb of ammonia is 1.8 ×10−5.
1.
4 answers
asked by
Douglas
6,036 views
A solution contains 0.022 M Ag and 0.033 M Pb2 . If you add Cl–, AgCl and PbCl2 will begin to precipitate. What is the
4 answers
asked by
Sally
7,736 views
A solution of H2SO4(aq) with a molal concentration of 1.94m has a density of 1.119g/mL. What is the molar concentration of this
5 answers
asked by
Akle
6,169 views
Give the formula of each coordination compound. Include square brackets around the coordination complex. Do not include the
4 answers
asked by
HELP!!!!!!!!
3,947 views
When aqueous solutions of sodium sulfate and lead (II) nitrate are mixed lead sulfate precipitates out of soultion. Calculate
6 answers
asked by
Bella
9,907 views
Which of the following formulas -- NO, N2O, NO2, N2O, N2O4, AND N205 -- represent the empirical and molecular formulas of the
4 answers
asked by
Jeaninne
5,838 views
suppose that you have a n unlimited supply of copper II chloride to react with iron. how manyt moles of copper would be produced
5 answers
asked by
Lily
3,557 views
calculate number of nucleons in 10cm^3 fluorine gas
5 answers
asked by
Anonymous
1,559 views
Consider the following chemical equation:
2NO2-->N2O4 If 25.0mL of NO2 gas is completely converted to N2O4 gas under the same
5 answers
asked by
Victoria
7,948 views
What is the mass of sodium needed to make 2 g of sodium oxide (4Na + O2 → 2Na2O)?
Ar values: O = 16, Na = 23. please help I'm
5 answers
asked by
bob
4,983 views
How many moles of O2 are needed to react with 2.50 mol of C2H2?
5 answers
asked by
Anonymous
4,064 views
Copper sulfate is a hydrated crystal with the formula CuSO4*5H20 and a deep blue color. when its heated, the crystals crumble
5 answers
asked by
Anonymous
5,009 views
Consider a generic redox reaction then suppose that the coefficients in the redox reaction are doubled. How will the following
4 answers
asked by
Christopher
12,071 views
White phosphorus, P4, spontaneously bursts into flame in oxygen. if 6.5g of white phosphorus reacts with sufficient oxygen to
5 answers
asked by
Amahler
2,102 views
How do I prepare 100mL of 10g/L HCl from concentrated HCl(37%HCl, density 1.19g/mL)
Is it 2.28mL of conc HCl dilute to 100mL with
6 answers
asked by
annie
16,312 views
What is the bond order of OH- and OH+?
I tried to solve it but couldn't so Im about to give up. Help me please.
10 answers
asked by
Tom
4,716 views
A gas cylinder contains a mixture of carbon dioxide and oxygen, which have different molecular masses. The contents of the
4 answers
asked by
Maggie
2,702 views
Describe how you would prepare dry sample of calcium chloride in the laboratory
4 answers
asked by
Andrew
944 views
A test of an automobile engine exhaust revealed that 3.7g of NO2 was emitted in 10 minutes of operation. How many moles of NO2
4 answers
asked by
PJcotieboi
3,126 views
Consider the titration of 30.0 mL of 0.050 M NH3 with 0.025 M HCl. Calculate the pH after the following volumes of titrant have
4 answers
asked by
john
2,277 views
Calculate the mass of CuFeS2 needed in g to produce 600.0 g Cu if the yield for the conversion process is 82%.
5 answers
asked by
Cierraa
1,920 views
How much heat, in kilojoules, is associated with the production of 273kg of slaked lime, Ca(OH)2?
CaO(s)+H2O(l)-->Ca(OH)2(s)
6 answers
asked by
Lisa
5,519 views
The numbers on the top of the coumns on the periodic table represent
A The number of valence electrons that each of those
4 answers
asked by
Anonymous
2,806 views
4. At high temperatures, nitrogen dioxide, NO2, decomposes into NO and O2. If y(t) is the concentration of NO2 (in moles per
4 answers
asked by
Sarah
2,679 views
a chemist needs to order Na2B4O7. One supplier offers it in an anhydrous (without water) form, while another offers it as a
4 answers
asked by
Anonymous
3,691 views
need help to balance half reaction in basic solution
IO3 to I2
4 answers
asked by
Shana
10,726 views
Consider the equilibrium: H2O(l) + HC2H3O2 ⇌ H3O+ + C2H3O2-
( All species are aqueous) Why will the addition of NaOH to a
4 answers
asked by
Ceamus Angelina
3,141 views
A 0.446 g- sample of an unknown monoprotic acid was titrated with 0.105 M KOH. the molar mass is 120 g/mol What is the pKa
7 answers
asked by
james
4,100 views
A solution of iodine (I2) in carbon tetra-chloride(CCl4) is used when iodine is needed for certain chemical tests. how much
5 answers
asked by
punk480
3,512 views
How many liters of CO2 form at STP if 5.0g of CaCO3 are treated with excess hydrochloric acid? show all your work
5 answers
asked by
nichole
4,122 views
How many grams of Butane (C4H10) must be burned to release 6375 KJ of heat?
Given: Molar mass of C4H10 =
4 answers
asked by
Kell
2,903 views
A sample of impure magnesium was analyzed by allowing it to react with excess HCl solution:
Mg(s) + 2 HCl(aq) → MgCl2(aq) +
5 answers
asked by
James
4,293 views
Carbon dioxide gas has a solubility of 0.0972 g/100 g H2O at 40 degrees celsius. Expressed in parts per million, this
7 answers
asked by
Bob
5,869 views
Which of the following aqueous solutions would you expect to be the best conductor of electricity at 25 degrees celcius? Explain
5 answers
asked by
Amber
3,992 views
Consider the elementary reactions and their rate constants.
A(g)+B(g)⟶C(g)+D(g) 𝑘𝑓=5.72×10−^2 s^−1
5 answers
asked by
Danya
2,706 views
Given the following acid dissociation constants, which acid has the strongest conjugate base?
a. HCN Ka = 6.2 x 10-10 b. HOCl Ka
5 answers
asked by
Christine
2,154 views
A gas mixture in a 1.55L at 298K container contains 10.0g Ne and 10.0g Ar. Calculate the partial pressure " in atm" of Ne and Ar
5 answers
asked by
Mark
4,083 views
My teacher gave us a packet with many questiona on it for homework. I was able to figure all 44 questions except the following
5 answers
asked by
Courtany
2,967 views
If heat of combustion of acetylene C2H2 is -1301.1 kJ/mol then :
a) Write balanced thermochemical equation of acetylene
5 answers
asked by
MAD
4,557 views
Calculate the pressure that ccl4 will exert at 40 of 1.00 mol occupies 28.0 L, assuming that
(a) CCl4 obeys the ideal-gas
7 answers
asked by
Anonymous
4,379 views
A liter of 2M NaOH solution contains how many grams of NaOH?
5 answers
asked by
Victoria
2,932 views
You have a stock 0.100 M solution of KMnO4 and a series of 100-mL volumetric flasks. What volumes of the stock solution will you
7 answers
asked by
confused
2,531 views
In a titration experiment, 20.4 mL of 0.883 M 𝐻𝐶𝑂𝑂𝐻 neutralize 19.3 mL of 𝐵𝑎(𝑂𝐻)2. What is the
5 answers
asked by
Shiro
2,850 views
1.0 M aqueous solutions of
AgNO3 , Cu(NO3 )2 and Au(NO3 ) 3 are electrolyzed in the apparatus shown, so the same amount of
4 answers
asked by
James
3,515 views
Calculate [OH-] and pH for the following strong base solution: 10.0 mL of 0.0105 M Ca(OH)2 diluted to 500.0 mL
5 answers
asked by
Kendall
3,053 views
The compound M2X3 has a molar solubility of 0.0190 M. What is the value of Ksp for M2X3?
Here are the choices: 1. 3.52 × 10^-6
4 answers
asked by
Sara
2,687 views
The purity of a pharmaceutical preparation of sulfanilamide, C6H4N2O2S, can be determined by oxidizing the sulfur to SO2 and
5 answers
asked by
darren
3,413 views
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