09/29/19

When a 13.00-g sample of solid potassium hydroxide dissolves in 200.0 g of water in a coffee-cup calorimeter (the following Figure), the temperature rises from 21.6 o C to 40.6 o C.
Calculate ΔH(in kJ/mol KOH) for the solution process KOH(s)→K+(aq) + -OH (aq)
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09/29/19

CHEMİSTRY PLEASE Help ME
Given unlabelled samples ethanol,ethanoic acid and ethyl ethanoate but weren’t allowed smell how you might identify which one was which?
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09/29/19

Could Someone Help Me With This Question??
How many mL of 6.00 (M=mol/L) stock solution do you need to make 1.00 liters of 0.100 M of NaOH?
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09/27/19

Stochiometry Problem
Bismuth oxide reacts with carbon to form bismuth metal: Bi2O3(s) + 3C(s) → 2Bi(s) + 3CO(g) When 28.0 g of Bi2O3 reacts with excess carbon, (a) how many moles of Bi form? (b) how many grams of CO form? more
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09/27/19

A concentrated solution of HF has a molarity of 8.25 M. You add 23.50 mL to a flask and then dilute with water. The mass of the final solution is 125.0 g. What is the mass percent of HF ?
I can't figure it out. Please help, thank you
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09/26/19

Enough of a monoprotic weak acid is dissolved in water to produce a 0.0110 M solution. The pH of the resulting solution is 2.34 . Calculate the Ka for the acid.
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09/26/19

The 𝐾 a Ka of a monoprotic weak acid is 0.00584. 0.00584. What is the percent ionization of a 0.181 M 0.181 M solution of this acid?
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09/26/19

Calculate the pH of the resulting solution when 3.00 mL of the 3.00 M acetic acid is diluted to make a 250.0 mL solution.
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09/26/19

The Ka value for acetic acid, CH3COOH(aq) , is 1.8×10^−5 .
Calculate the pH of a 3.00 M acetic acid solution.
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09/25/19

chemistry question

how do you write the equation for the standard heat of formation for: NaCl(s), HNO3 (g) BaCO3 (s)
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09/25/19

enthalpy question

Find ∆Hrxn for this reaction using the standard enthalpies of formation.C5H12(l)+8O2 (g)--> 5CO2 (g) + 6H2O(g)
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09/25/19

chemistry question

50.0 mL of 1.0 M HCl (at 22.0oC) and 50.0 mL of 1.0 M NaOH (at 22.0oC) are mixed. The solution temperature rises to 28.9oC. How much heat was released by the reaction? (d=1.00 g/mL)
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09/25/19

chemistry question

you have 100.0 g of water at 10. 0C. You add 500.0 J of energy. What will be the final temperature ofthe water? (𝑐𝑐𝑠𝑠 =4.184 𝐽𝐽/(𝑔𝑔∙°C))
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09/24/19

A 5.00 g sample of aluminum pellets and a 10.00 g sample of ...
A 5.00 g sample of aluminum pellets and a 10.00 g sample of iron pellets are placed together in a dry test tube, and the test tube is heated in a boling water bath to 100°C. The mixture of hot iron... more
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09/24/19

Mole fraction, weight %, Molarity
6.0m solution of NAOH has a density of 1.39 g/cm3 at 20°C. Calculate mole fraction, weight percent, the molarity of NaOH
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09/24/19

Diffusuon of Dye
Which diffuses faster? 1M methylene blue in 1.5% agar or 0.1M of congo red in 1% agar
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09/23/19

Potential and Kinetic Energy - Math Problems
A 50 kg diver stands motionless at the top of 10.0 meter high dive. What is her potential energy? Your pet puppy Scruffy can run up to 2 meters/sec (m/s) on his fastest days. Scruffy has a mass of... more
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09/23/19

Chemical equation
How many moles of ammonia will be formed when 12g of hydrogen is reacted with nitrogen?
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09/23/19

Chemical equation
How many moles of ammonia will be formed when 12g of hydrogen is reacted with nitrogen?
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09/23/19

Given Kp, find Kc
Calculate Kc for the following reaction,2 SO2(g) + O2(g) <=> 2 SO3(g);Kp = 71.3 at 65 o CGive your answer to the nearest whole number.please explain your answer
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09/23/19

At a certain temperature, Kp for the reaction is 789.5, calculate the value of Kp for the following reaction
At a certain temperature, Kp for the reaction,H2(g) + Cl2(g) <=> 2 HCl(g) is 789.5.Calculate the value of Kp for the reaction,1/2 H2(g) + 1/2 Cl2(g) <=> HCl(g)the correct answer is:... more
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09/23/19

When the following equation is balanced using the smallest possible integers, what is the exponent of Al in the reaction quotient expression?
When the following equation is balanced using the smallest possible integers, what is the exponent of Al in the reaction quotient expression?Al(s) + NaOH(aq) + H2O(l) <=> Na(Al(OH)4)(aq) +... more
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09/23/19

Given the values of K shown below, determine the value of K for the reaction
Given the values of K shown below, determine the value of K for the reactionN2(g) + 2 O2(g) <=> 2 NO2(g).N2(g) + O2(g) <=> 2 NO(g)       K = 2NO2(g) <=> NO + 1/2 O2(g)    K =... more
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09/22/19

Can you calculate the molarity of the NaOCl in bleach which is 8.25%?
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09/22/19

How many mL of a 2.00M NaOH solution would you need to neutralize 12.7 mL of a 1.75M HCl solution?
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