05/23/19

Need help with my question in Electrochemistry
Calculate the Zn conc. of Zn/Zn++ // Cl/Cl- 0.1M Emf=2.21v answers:a)0.1M b)0.2M c)0.05M d)0.15M
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05/22/19

Chemistry Titration
How many mL of a 0.5 M HCL would be needed to neutralize 725 mL of a 1.0 M NaOH?
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05/22/19

Stoichiometry question

Calculate the mass of precipitate formed when 17.40g of aqueous silver nitrate is reacted with excess potassium chloride solution at SATP
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05/22/19

The value of the equilibrium constant?
The following reaction occurs:A(g)  + B(g) ↔  C(g) + D(g)The initial concentrations of A(g) and B(g)  are both 2.10 mol/L. At equilibrium, A(g) has a concentration of 1.74. The value of the... more
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05/22/19

When you are making a cup of coffee, you add sugar to sweeten it up. Describe three ways that you can increase the rate at which the sugar dissolves. For each method, provide scientific explanations.
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05/22/19

15.00 g aluminum sulfide and 10.00 g of water react until the limiting reactant is used up the products for the reaction are aluminum hydroxide and hydrogen sulfide gas
A. Calculate the theoretical yield of H2SB. A student performs the reaction. The student's empty flask has a mass of 28.55 grams. The flask and H2S have a combined mass of 36.77 grams. Determine... more
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05/22/19

A copper coin with a mass of 6.30 grams changes temperature in the sunshine from 20.0°C to 32.0°C. How much energy is transferred?
The amount of energy transferred to the coin is  how many joules.
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05/22/19

A small container is filled with liquid water. What can happen if the container of water is an open system that couldn’t happen if it were a closed or isolated system?
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05/22/19

the equilibrium concentration of NO2 is ?
Initially 0.105 mol/L of N2O4(g) is placed in a flask and allowed to reach equilibrium as shown in the reaction below:N2O4(g) ↔   2 NO2(g)At equilibrium the concentration of N2O4 was found to be... more
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05/22/19

The value of the equilibrium constant?

0.450 mol of hydrogen bromide gas decomposes in a 0.75 L container according to the reaction below:2 HBr(g)  ↔ H2(g) +  Br2(l)At equilibrium the concentration of H2(g) was found to be 0.130 mol/L.... more
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05/22/19

Determine the equilibrium constant?
Determine the equilibrium constant for the reaction below given the following concentrations at equilibrium:NO2(g) + CO(g) ↔  NO(g) + CO2(g) [NO2]= 0.040 mol/L [CO]= 0.033 mol/L [NO] = 1.7... more
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05/22/19

Find the equilibrium law expression?
Once you have balanced the following chemical equation, find the corresponding equilibrium law expression:C3H8 (g) + O2(g) <--> CO2(g) + H2O(g)
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05/22/19

What is the corresponding equilibrium law expression?
Once you have balanced the following chemical equation, find the correct corresponding equilibrium law expression:Ag2CO3(s)  ↔ Ag(s)  + CO2(g)  + O2(g) 
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05/22/19

An average human brain uses around 120 grams of glucose per day. How many molecules of glucose does your brain burn daily?
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05/22/19

How many atoms of carbon are present in a diamond that weighs 4.5 * 10^-3g? (Diamond = carbon)
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05/20/19

How many grams of sugar are in a 15 % m/m solution with total mass 1100 g ?
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05/20/19

The solubility of AgCl is 8 grams / kg of water. What is this concentration in ppm ?
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05/20/19

Each 100 mL ( 1 mL of water = 1 g ) of pond water in a tidal area contained 34 mg of salt . Calculate the salt concentration of the pond in ppm

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05/20/19

the water from a 375 mL can soft drink was evaporated and other materials were removed , 47.3 g of sugar remained. Calculate the concentration of sugar in the original drink in grams per liter .
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05/20/19

What is it’s concentration in % m/v of a solution prepared by dissolving 15 g of NaCl in 100 mL of water , resulting a total solution volume of 102 mL ?
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05/20/19

What is the % v/v of ethanol in a solution if 10 ml of ethanol is added to 90 ml of water ?
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05/20/19

How much energy is required to raise the temperature of 175g of water from -11C to 140C
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05/20/19

Stoichiometry And Percent Yield of C3H8+ 5O2 = 3Co2 + 4H2O Please answer 1-5 (work would be nice) Thank you

C3H8+ 5O2 = 3Co2 + 4H2OCalculate the expected theoretical yield of Co2 in Moles A.If 1.62 Moles of Of C3H5 were used B. If 11.6 Moles of O2 were used 2.As in the above reactions, if both 1.62... more
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05/19/19

How much Magnesium chloride would you need to put in 555 g of water to raise the boiling point by 11 o C
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05/19/19

Saline solution for intravenous drips have a NaCl concentration of 0.90 m/m . Calculate the mass of salt needed to make 500 g of saline fluid.
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