03/05/20

Finding concentration from pH and Kb
A certain weak base has a Kb of 8.40×10-7. What concentration of this base will produce a pH of 10.16?
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03/05/20

Finding pH from Ka
If 8.2 g of butanoic acid, C4H8O2, is dissolved in enough water to make 1.0 L of solution, what is the resulting pH?Ka of butanoic acid = 1.5 x 10-5
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03/05/20

Percent Ionization
The Ka of a monoprotic weak acid is 0.00663. What is the percent ionization of a 0.131 Msolution of this acid?
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03/05/20

If you wanted to make 8.3 x 10^23 molecules of ammonia, how many molecules of starting material would you need of each reactant. H2 and N2
i don't understand how to do this problem and it's due soon!! please help
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03/05/20

if 12.5 grams of hydrogen are made to react with excess carbon monoxide how many grams of product can theoretically be produced

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03/05/20

Light (waves) has three basic characteristics: wavelength, frequency and speed...
Discuss these characteristics and include the symbols chemists generally use to represent these quantities?
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03/05/20

If more NO NO is added, bringing its concentration to 0.900 M, 0.900 M, what will the final concentration of NO NO be after equilibrium is re‑established?
At equilibrium, the concentrations in this system were found to be [N2]=[O2]=0.200 M and [NO]=0.600 M.N2(g)+O2(g)−⇀↽−2NO(g)If more NO is added, bringing its concentration to 0.900 M, what will the... more
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03/05/20

Chemistry question
Aqueous solutions that contain silver ions are usually treated with chloride ions to recover silver chloride. What is the minimum volume of 0.25 mol/L magnesium chloride need to precipitate all the... more
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03/04/20

What is the value of the equilibrium constant at this temperature for the reaction of SO2 with N2O to form SO3 and N2? Make sure you balance the reaction using the lowest whole-number coefficients.
At a certain temperature, a 22.5-L container holds four gases in equilibrium. Their masses are 3.5 g SO3, 4.6 g SO2, 11.3 g N2, and 0.98 g N2O.What is the value of the equilibrium constant at this... more
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03/04/20

Percent Ionization
A.)Calculate the percent ionization of 7.5×10−3 butanoic acid B.)Calculate the percent ionization of 7.5×10−3 butanoic acid in a solution containing 7.5×10−2 sodium butanoate.
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03/03/20

Acid and Bases Titration Lab
using Stoichiometry and the balanced equation, find the moles of acetic acid used in each of your vinegar titrations.Balanced Equation: NaOH + CH3COOH—>NaCH3COO +H2OTitration 1: 5.361x10-3Moles... more
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03/03/20

How many grams of aluminum chloride can you make if 3.70L of Chlorine gas at STP reacts with excess aluminum? Hint: Do the Balanced equation first; be careful with formulas
2Al+3Cl2–>2AlCl3 is the balanced equation but I’m unsure of where to go from here
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03/02/20

Using the standard enthalpies of formation, what is the standard enthalpy of reaction? CO ( g ) + H 2 O ( g ) ⟶ CO 2 ( g ) + H 2 ( g )
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03/02/20

What is the heat of combustion of ethane, C 2 H 6 , in kilojoules per mole of ethane? Enthalpy of formation values can be found in this list of thermodynamic properties.
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03/02/20

please help with my chemistry homework
A 2.50 g sample of powdered zinc is added to 100.0 mL of a 2.00 M aqueous solution of hydrobromic acid in a calorimeter. The total heat capacity of the calorimeter and solution is 448 J/K. The... more
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03/02/20

A 53.93 g sample of a substance is initially at 21.3 °C. After absorbing 1993 J of heat, the temperature of the substance is 145.8 ° C. What is the specific heat ( c ) of the substance?
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03/02/20

Chem homework please help!

When aqueous solutions of cadmium sulfate and lithium hydroxide are mixed, white solid camo un hydroxide is formed in a colorless solution of lithium sulfate. Write a balanced chemical equation... more
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03/02/20

In the gas mixture containing 88 grams of oxygen gas (O2), 88 grams of nitrogen gas (N2), and 12 grams of nitrogen dioxide gas (NO2), what is the mole fraction of nitrogen gas?
0.450.510.810.12
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03/02/20

Gas law chemistry lab

Write the mathematical formula for Charles law ?
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03/02/20

Chemistry pH question
CH3NH2 is a weak base (Kb=5.0×10−4), so the salt CH3NH3NO3 acts as a weak acid. What is the pH of a solution that is 0.0850 M in CH3NH3NO3 at 25 ∘C?
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03/02/20

Which of the following are identical amounts of energy?
1kJ and 1 kcal1kJ and 239 cal1kJ and 1 Cal4.184 J and 1 kcal
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03/02/20

To calculate the heat absorbed or released, you need to measure what
A. Mass, volume, change in temperature B. Mass, specific heat, change in temperature C. Specific heat, change in temperature, time to heatD. Mass, specific heat, time to heat
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03/02/20

Use Hess's Law to calculate the heat of reaction for the following reaction :
A + 3B —> 3C + 2DA + 28 —> C+ D H= -20 kJ B —> 2C+ D H= -45 kJ (ANSWER CHOICE )a. -65 kJb. +65 kJc. -25 kJd. +25 kJ
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03/02/20

A 1.7g potato chip is burned down to 0.2g in a calorimeter that contains 400.0 g of water
The temperature of the water rises from 21°C to 31°C. The specific heat of water is 1cal/g^ C . How much heat in cal was given off in the reaction?A. 2.7 calB. 4000 calC. 4 calD. 15 cal
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03/01/20

How many grams of table salt (sodium chloride) can be produced from 10 g of sodium and 12.5 grams of chlorine gas?
Label excess and limiting reactants.
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