09/12/21

chemistry problem
How many atoms of phosphorus are in  6.20 mol of copper(II) phosphate?What is the formula for copper(II) phosphate? Capitalization and punctuation count.
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09/12/21

How to answer this
Antimony has two naturally occuring isotopes, Sb121 and Sb123 . Sb121 has an atomic mass of 120.9038 u , and Sb123 has an atomic mass of 122.9042 u . Antimony has an average atomic mass of... more
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09/12/21

How do you answer this in steps
On another planet, the isotopes of titanium have the given natural abundances.Isotope Abundance Mass (u)46Ti 74.500% 45.9526348Ti 15.200% 47.9479550Ti 10.300% 49.94479What is the average atomic... more
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09/12/21

What is the Wavelength? - 2
Help with this question. What is the wavelength? What is the wavelength in meters of an electromagnetic wave whose frequency is 2.07 x 10^12 s^-1?
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09/12/21

Which of the following expressions is the correct equilibrium-constant expression for the equilibrium shown? 2 A (g) --> B(g) *arrow goes both ways*
A. [A][B]B. [B]/[A]C. [B]/[A]^2D. [B]^2/[A]E. [B]^2[A]
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09/12/21

A first order reaction has a rate constant of 0.20287 at 45.5 oC. Given that the Arrhenius constant for the reaction is 2.7 x 1010 sec -1, what is the value of the activation energy (in kJ/mol)?
Enter your value to three significant figures.
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09/12/21

Is diluting an acidic or basic solution with water an effective means of affecting its pH? Why or why not?
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09/12/21

evaluate the chemical formula
Fatty acids have a general formula of CxHyOz. A technician wants to determine the type of pure fatty acid isolated from a metabolite mixture. As 16.71g of the pure fatty acid is fully combusted... more
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09/12/21

Chemical kinetics question

1) The hydrolysis of sucrose (C12H22O11) into glucose and fructose in acidic water has a rate constant of 1.8 x 10-4 s-1 at 25oC. Experimentally, it is found that the rate of reaction only depends... more
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09/11/21

Baking powder must contain 1 mole of potassium bitartrate (KNaC4H4O6) for every mole of sodium bicarbonate (NaHCO3). If you have 1 mole of NaHCO3, calculate how many grams of KNaC4H4O6 you will need.
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09/11/21

a) Using standard reduction potentials, identify the anode and the cathode and determine the cell potential for a galvanic cell composed of copper and iron. Assume standard conditions.
a) Using standard reduction potentials, identify the anode and the cathode and determine the cell potential for a galvanic cell composed of copper and iron. Assume standard conditions.b) Confirm... more
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09/11/21

Dimensional Analysis

0.00078 cm -----> Um
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09/10/21

Calculate the fraction of association
Calculate the fraction of association of a 0.30 F benzoic acid solution. Ka forBenzoic acid (C6H5COOH) is 6.28 x 10-5 .
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09/10/21

How to calculate the mass percentage?
The quantity of atmospheric SO2(g) can be determined by reaction with H2O2(aq) according to the balanced chemical equation shown.H2O2(aq)+SO2(g)⟶H2SO4(aq)The amount of sulfuric acid produced can be... more
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09/10/21

Dimensional Analysis
1.) 0.0043g ----> mg2.) 9474 mm ----> cm3.) 360 um -----> dm4.) 67.3 KL -----> dL
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09/10/21

What is the mass in grams of 100,000 gold atoms each weighing 197 amu
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09/10/21

Acetone is a common solvent that has a density of 0.7899 g/mL. What volume of acetone, in milliliters, has a mass of 45.9 g ?
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09/10/21

What equation correctly represents the combustion of acetone, C2H6O in excess of oxygen?
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09/10/21

Empirical Formula
An unknown compound contains only C, H, and O. Combustion of  3.60 g of this compound produced 8.48 g CO2 and 2.31 g H2O. What is the empirical formula of the unknown compound? Insert subscripts... more
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09/09/21

How is ammonium (NH4+) an ionic bond?
I was taught that ionic is metal/transition metal + non-metal. N is a non-metal and H is a non-metal, so I thought NH4+ would be a covalent. However, on a quiz today, we were supposed to count all... more
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09/09/21

The label on a smaller container reads mass 3.000g. A sample of a chemical reads 3.014g. What is the mass in mg?
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09/09/21

What is the value of Kc?
Consider the synthesis of ammonia:N2(g) + 3H2(g)<=>2NH3(g)At 926.5 °C, the equilibrium constant Kp is 4.09  × 10–5. What is the value of Kc?
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09/09/21

What is Kc at 361 K for the reaction:
Kc = 0.00451  for the reaction below at 361 K.N2(g) + 3H2(g) <=> 2NH3(g)What is Kc at 361 K for the reaction:1/3N2(g)+H2(g)<=> 2/3NH3(g)
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09/08/21

A weak acid, HA, has a p𝐾a of 4.500 . If a solution of this acid has a pH of 4.154 , what percentage of the acid is not ionized? Assume all H+ in the solution came from the ionization of HA.
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09/07/21

The reaction A → B is first order in [A]. Consider the following data.

Time (s): 0.0 ; 5.0 ; 10.0 ; 15.0 ; 20.0[A] (M): 0.20 : 0.14 ; 0.10 ; 0.071 ; 0.050The concentration of A is ________ M after 40.0 s.
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