05/19/19

What is the % m/m of a solution contain 55.6 g CaCl2 and having a total mass of 556 g ?
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05/18/19

Why do different pain killers have different effects on people?
I've noticed some pain killers working great for me, while others have no effect. I doubt there is much of a placebo effect at work, since most of these either did or did not work when I first took... more
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05/18/19

In photosynthesis carbon dioxide and water are combined to yield glucose and oxygen gas. I f 16.7 kg of water are adsorbed by a tree, what volume of oxygen would the tree yield
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05/18/19

finding the pressure at equilibrium
Consider the following reaction.If a sample of A(g) at 2.60 atm is heated to 500 K, what is the pressure of B(g) at equilibrium?2A(g)--><--B(g) kp=4.22x10^-5 at 500 k
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05/17/19

Finding the equilibrium constant
At a certain temperature, 0.5011 mol of N2 and 1.621 mol of H2 are placed in a 2.50-L container.N2(g) + 3H2(g) --><---2NH3(g)At equilibrium, 0.1401 mol of N2 is present. Calculate the... more
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05/17/19

Chemistry questions

You are given a sample of chlorine gas with a volume of 9.00 liters, a temperature of 15 degrees Celsius, under pressure of 80.0 kilopascals. How many miles of chlorine gas do you have?
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05/17/19

consider voltaic cell at 25 deg celsius in which the following reaction takes place 3O2 + 4NO +2H2O yields 4NO3- + 4H+ calculate E not
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05/16/19

Calculating the kb
The pH of a 0.016 M aqueous solution of p-toluidine (CH3C6H4NH2) is 8.60. Calculate the kb.
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05/16/19

How many grams of both nitrogen and hydrogen gas are required to produce 400.0 grams of ammonia gas
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05/16/19

How many mg of N are in a diet coke assuming a normal diet coke has 192 mg of aspartame?
For every aspartame molecule, there are two nitrogen atoms. First, you must find the percent mass of nitrogen in the total molecule.28 (approximate mass of two N)/ 294.3 g/mol (mass of aspartame) =... more
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05/15/19

Chemisty Review
The density of osmium, which is the densest metal, is 22.57 g/cm3 . What is the mass of a block of osmium that measures 1.00 cm by 4.00 cm by 2.50 cm?
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05/15/19

Decomposition of NOCl
The decomposition of NOCl follows the reaction2NOCl →2NO + Cl2It is a second- order reaction with k= 6.7 ×10−4 Lmol s at 400 K.a.) What is the half- life of this reaction if the initial... more
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05/15/19

Units for Rate Law
What are the units for the rate constant, k, in the following rate law:rate=k[NH4+][NO3−]
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05/15/19

Rate Law and Order of Reactions
The reaction:2I− (aq) + S2O82− (aq) →I2 (aq) + 2SO42− (aq)was studied at 25 Celsius. The following results were obtained whereRate=(−)∆[S2O82−]∆t[I−]0(mol/L) [S2O82−]0(mol/L) Initial Rate(mol/L... more
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05/15/19

Rate Law and Rate Reaction
The reaction:2 NO (g) + Cl2 (g) →2NOCl (g)was studied at -10 Celsius. The following results were obtained whereRate =(−) ∆[Cl2]∆t[NO]0(mol/L) [Cl2]0(mol/L) Initial Rate(mol/L... more
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05/15/19

Decomposition Question
At 40 Celsius, H2O2 (aq) will decompose according to the following reaction:2H2O2 (aq)→2H2O (l) + O2 (g)The following data were collected for the concentration of H2O2 at various... more
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05/15/19

Rate Law Problem
A reaction has the following rate law:rate=k[BrO3−][Br−][H+]2What are the units for k, the rate constant?
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05/15/19

74.5 g. Of a metal chloride contain 25.5 g. Of chlorine. The equivalent mass of the metal
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05/14/19

Rate of Diddappearance
For the reaction A + 3B →2C it was found that the rate of disappearance of B was 0.15 mol/L s. What is the rate of disappearance of A and the rate of appearance of C?
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05/14/19

S reacts with F2 in a synthesis react what mass in g of SF6 is produced by the reaction of 3.5 g of S with 4.5 g of Fl ? How many g of the excess reactant remain?
Do your results agree with the law of conservation of mass?
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05/14/19

15.00 g aluminum sulfide and 10.00 g of water react until the limiting reactant is used up the products for the reaction are aluminum hydroxide and hydrogen sulfide gas
A. Calculate the theoretical yield of H2SB. A student performs the reaction. The student's empty flask has a mass of 28.55 grams. The flask and H2S have a combined mass of 36.77 grams. Determine... more
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05/14/19

MnO2 reacts with HCI to form MnCI2 , CI2, and H2O determine the amount of each chemical present at the end of the reaction if 74.8 g of manganese iv oxide reacts with 48.2 grams of hydrochloric acid
A. g of manganese iv oxide?B. g hydrochloric acid?C. g manganese ii chloride?D. g chlorine?E. g H2OF. Verify the law of conservation of mass using your results
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05/13/19

Ocean Acidification
How does concentration, atmosphere and ocean temperature, and mixing affect solubility?Also, what are the affects if it goes reverse?Here is my reaction:CO2+H2O ↔H2CO3↔H↔HCO31-↔2H↔CO3
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05/13/19

Calculate pH of solution

Calculate pH of a solution with [H3O+]=6x10 -9 M
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05/13/19

Calculate pH???
Calculate pH of a solution with [H3O+]=1.0x10 -6 M
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