05/07/21

What mass of Na2A should you add to NaHA solution to create a buffer with pH = 5.82?
Sodium hydrogen succinate (NaHA) is a weak acid with pKa of 5.61. You have 10.0 mL of 0.283 M NaHA solution. How much Na2A should you add in grams to the NaHA solution to create a buffer with pH =... more
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05/06/21

How many grams of magnesium cyanide are required to make this solution?
How many grams of magnesium cyanide are required to make 275 mL of 0.075 molarity solution?
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05/03/21

Verify the following trig identity
Verify the following trig identity: sin(x+y)*sin(x-y) = sin2(x) - sin2(y)
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05/03/21

Verify the following trig identity
Verify the following trig identity: sin(a+b)/(cos(a)*cos(b)) = tan(a) + tan(b)
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04/16/21

HELP THIS IS URGENT

4 Al(s) + 3 O2(g) → 2 Al2O3(s)What is the minimum number of grams of aluminum metal required to produce 4.00 mole of aluminum oxide?
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04/16/21

HELP ME PLEASE IM LOSING MY MIND WITH THIS ?
2 CO + O2→ 2 CO2,how many grams of carbon dioxide is produced when 0.88 mole of carbon monoxide reacts completely with oxygen gas?
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04/16/21

The​ half-life of radium
The​ half-life of radium is 1690 years. If 20 grams are present​ now, how much will be present in 50 ​years?
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04/16/21

How to solve this? Riemann's Sum
Consider the region bounded by y = 12 − 3x, the x-axis, and the y-axis. Estimate the area of the region using a lower Riemann sum with four rectangles of equal width (in other words, the height of... more
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04/15/21

Photon to break C=C bond
The C= C bond is very strong with a large bond energy of 962 kJ/mol. Calculate the frequency of the photon required to break this bond. Calculate the wavelength of the photon required to break a... more
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04/13/21

A 15.0 mL solution of Ba(OH)₂ is neutralized with 30.5 mL of 0.200 M HCl. What is the concentration of the original Ba(OH)₂ solution?
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04/13/21

Ammonia gas (NH3) is formed in a synthesis reaction. (All volumes are measured at STP)
Write the balanced equation. What volume of hydrogen will completely react with 22.4 liters of nitrogen? What volume of ammonia will be formed? Explain and solve.
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04/13/21

Calculate the concentration of H+
The pH of maple syrup is 5.2. Calculate the concentration of H+)ions. PH = − log [H+] (show work and write your answer in scientific notation, round to tenths)
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04/12/21

Predict the product of the following reaction, balance the equation, and state the type of reaction:

C3H7OH + O2 --> ?
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04/12/21

quantum numbers
a.) List all of the possible values for l in the 2nd energy level (n = 2). Leave fields blank if they are not needed.
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04/12/21

A certain forest covers an area of 2400 km2. Suppose that each year this area decreases by 3% What will the area be after 12 years?
A certain forest covers an area of 2400 km2. Suppose that each year this area decreases by 3% What will the area be after 12 years? Round your answer to the nearest square kilometer.
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04/03/21

At a certain temperature, 0.4811 mol of N2 and 1.761 mol of H2 are placed in a 4.50 L container. N2(g)+3H2(g)↽−−⇀2NH3(g) At equilibrium, 0.1201 mol of N2 is present.
Calculate the equilibrium constant, 𝐾c .
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04/03/21

Consider the system of equations

Consider the system of equation - 2x+3y=8 2x+6y=12what could be the first step in solving the system of equations using eliminationa. Multiply the first equation by -1b. Add 4 to both sides of... more
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04/03/21

Consider the reaction: 4 Al + 3O2 --> 2 Al2O3 How many moles of aluminum react with 2.1 moles of oxygen?
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04/02/21

Seven times a number subtracted from the product of -2 and three times the number
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04/01/21

Determine the pH of a 0.100 M solution of HC₃H₅O₂ (Ka = 1.3 × 10⁻⁵).
Determine the pH of a 0.100 M solution of HC₃H₅O₂ (Ka = 1.3 × 10⁻⁵).Shoe ICE table and Ka expression set up(unsimplified and not combined terms)
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04/01/21

chemistry help...
How many moles of water are produced when 3.5 moles of propane combusts?
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04/01/21

what is x????..
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04/01/21

what is the mole ratio of iron to carbon monoxide?
In the reaction Fe2O3 + 3 CO → 2 Fe + 3 CO2 what is the mole ratio of iron to carbon monoxide?
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03/31/21

Percent Yield??
The percent yield of the reaction of aluminum with hydrochloric acid is 72%, how much aluminum should be reacted in order to recover90 grams of aluminum chloride.I figured out how to calculate... more
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03/31/21

At 1120 K, ∆G° = 82.1 kJ/mol for the reaction 3 A (g) + B (g) →2 C (g). If the partial pressures of A, B, and C are 11.5 atm, 8.60 atm, and 0.510 atm respectively
, what is the free energy for this reaction?__kJ/mol
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