05/04/20

Chemistry 60 Help
The equipment used for aviation communications emits high‑frequency radiowave energy with a wavelength of 0.700 km. What is the energy of exactly one photon of this radiowave radiation?E=What is... more
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05/04/20

Chemistry 60 Help
How many photons are produced in a laser pulse of 0.796 J at 449 nm?
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05/04/20

calcium metal reacts with phosphoric acid to produce calcium phosphate and hydrogen gas.

calcium metal reacts with phosphoric acid to produce calcium phosphate and hydrogen gas. if 8g of calcium react calculate a.the concentration of phosphoric acid if the volume of acid that reacts is... more
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05/04/20

What is the molarity of a solution made by mixing 50.0 g of magnesium nitrate, Mg(NO3)2, in enough water to make 250. mL of solution?
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05/04/20

What is the molarity of a solution made by mixing 3.50 g of potassium chromate (K2CrO4), in enough water to make 100 mL of solution?
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05/04/20

The Dead Sea contains approximately 332.0 g of salt per kilogram of seawater. Assume this salt is all NaCl. What is the molality of this solution?
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05/04/20

If 24.1 g of carbon monoxide and 13.8 g of oxygen combine to form carbon dioxide, how many grams of carbon dioxide must form?
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05/03/20

Determining Kb of base
A 0.135 M solution of a weak base (B) has a pH of 11.23. Determine Kb for the base. B(aq) + H2O (l) ⇄ BH+(aq) + OH-(aq), Kb = ? 
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05/03/20

Ionization Constant for acid
A 0.085 M solution a monoprotic acid HA has a percent ionization of 1.5%. Determine the acid ionization constant Ka for the acid
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05/03/20

[OH-], pH, and pOH of ammonia solution
Determine the [OH-], pH, and pOH of a 0.15 M ammonia solution. NH3(aq) + H2O(l)  ⇄ NH4+(aq) + OH-(aq)
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05/03/20

Calculating Concentration
Given the following reaction: 2CO(g) + O2(g) ⇄ CO2(g) with Kc = 4000. At equilibrium, the concentrations of O2 and CO2 are 0.10 M and 0.75 M, respectively. Calculate the concentration of CO at... more
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05/03/20

Calculating Kc Chemistry
5.0 mol of NOCl is placed an empty 1.0 L container. At equilibrium, 2.0 mol of Cl2 was found to be in the container. Calculate the value of Kc for this reaction:   2NOCl(g) ⇄ 2NO(g) + Cl2(g)
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05/03/20

Concentration Chemistry
The initial concentration of a reactant in a first order reaction is 1.25 M. The rate constant k is 0.02 min-1. How long will it take for the concentration to be reduced to 0.50 M?
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05/03/20

Osmotic Pressure Chemistry
Calculate the osmotic pressure, P, of a 300 mL solution made by dissolving 80 g of NaOH at 27 oC. 
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05/03/20

Freezing Point Chemistry
Calculate the freezing point of a solution of 400.0 g AlCl3 dissolved in 1600 g of water. The Kf value for water is 1.86 oC/m. 
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05/03/20

Boiling Point Chemistry
20.0 g of NaOH was dissolved in 200.0 g of water. Calculate the boiling point of the solution. Kb for water is 0.51 oC/m
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05/03/20

We prepare an aqueous solution (250ml) of CaCl2 given: concentration of Ca2+ = 0.06 mol\ L
after making the ionization equation of calcium chloride we need to find the concentration of chloride then the entire solution. How?
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05/02/20

Intial kinetics of the above reaction and get the following results:
Initial: PNO2= 1atm PF2=1 atm to rate of PNO2F formation=0.1 atm/secInitial: PNO2= 0.5 atm PF2=1 atm to rate of PNO2F formation=0.05 atm/secInitial: PNO2= 1 atm PF2=0.25 atm to rate of PNO2F... more
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05/02/20

For the following gaseous reaction:

2 NO2 +F2 --> 2NO2F Generalized rate equation = k(PNO2)2 (PF2)You test the initial kinetics of the above reaction and get the following results:Initial: PNO2 = 1 atm, PF2 = 1 atm --> rate of... more
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05/01/20

how many moles of zncl2 will be produced from 55.0 g of zn
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05/01/20

For the following reaction: A+2B+3C+D --> E , the kinetics expression has been experimentally determined to be: rate = k[A]^2[B][C]^0.5

a) What is the reaction order with respect to each of the reactants (A,B,C, and D)?b) What is the overall order of the reaction?c) If you were to double the initial concentration of A, half the... more
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05/01/20

Write a generalized rate equation for the reaction with variables for the order of reactions. Hint: do gaseous reaction use brackets or P?
For the following gaseous reaction: 2 NO2 +F2 --> 2NO2F
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05/01/20

help me please !!!
Help!! I missed a whole week of school and didnt learn gas problems! Can you help me out with these practice questions??Remember your pressure conversions: 1 atm = 14.7 psi = 760 mmHg = 101.3 kPa-... more
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05/01/20

Enthalpy of Formation: Calculate from Reaction Enthalpy
A scientist measures the standard enthalpy change for the following reaction to be -374.0 kJ :P4O10(s) + 6 H2O(l)4H3PO4(aq)Based on this value and the standard enthalpies of formation for the other... more
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05/01/20

Hess’s Law: Two Reactions
1) Given the standard enthalpy changes for the following two reactions:(1) 2Fe(s) + O2(g)2FeO(s)...... ΔH° = -544.0 kJ(2) 2Hg(l) + O2(g)2HgO(s)......ΔH° = -181.6 kJwhat is the standard enthalpy... more
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