04/18/19

Chemistry stuff
1. Using the bond energies table from the back cover of the book, determine the ∆H of thefollowing reaction (it may help to draw Lewis dot structures):2H2(g) + O2 (g) → 2H2O
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04/18/19

How many grams of ammonia are produced when 1.5 moles of hydrogen react?
I’m trying to complete a original credit packet and i don’t know how to solve this.
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04/18/19

How do you calculate the ratio of enzyme concentration to product?
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04/18/19

If you start with gas at 340 K in a container at 67 atm and the temperature rises to 480 K, what is the new pressure.
i dont know how to solve for both kelvins does anybody know its in Gay-Lussac's Law
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04/18/19

Chemistry Pressure
At a certain temperature, a mixture of 2 gases, 11.2 g of oxygen and 104.75 of krypton exert a total pressure of 4.25 atm. What is the partial pressure of each gas in mm Hg?
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04/18/19

Empirical formula
30.50g of an organic compound was combusted in oxygen to form 69.42 g of carbon dioxide and 28.40 g of water. In addition it was found that the compound contained 55.18% of oxygen. What is the... more
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04/18/19

Chemistry Gas Question
A gas occupies a volume of 160.5 mL at STP. What pressure in atmosphere, would it exert if it is transferred to another container with a volume at 285.0 mL and a temperature of 28.5 degrees Celsius?
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04/18/19

If 13 liters of nitrogen gas went into the reaction and hydrogen was unlimited, how many grams of ammonia were produced?
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04/18/19

balance the reaction
Balance the reaction between Sb2O5 and Mn to form SbO+ and Mn2+ in acidic solution. When you have balanced the equation using the smallest integers possible, enter the coefficients of the species... more
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04/17/19

What is the pH after 70 mL of 0.20 M HCI has been added to 50 mL 0.60 M H3CNH2? H3CNH2 has a pKb =3.42.
Please help with this question, I'm not sure how to go about it
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04/17/19

0.100 mol·L-1 NaAc solution. what is the pH?
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04/17/19

I need help with chemistry

  Calculate the mass of SO2 produced when 185 grams of oxygen reacts using this equation:         2Cu2S + 3O2 ----> 2Cu2O + 2SO2
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04/17/19

I need help on a stoichiometry
5.    If a student decomposes 58.498 grams of aluminum carbonate and she collects the gas and measures 27.68 grams of carbon dioxide, determine the percent yield for this... more
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04/17/19

Chemistry help? Any help would be appreciated, even if just equation setups. I looked in the merck index and online like it said, but couldn't find it.
1.) Look in the Merck index or online to find the toxicity of oil of wintergreen (methyl salicylate) for rats, in mg/kg of body mass.2.) How many grams of methyl salicylate would you personally... more
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04/17/19

Chemistry help? Any help would be appreciated, even if just equation setups. I looked in the merck index and online like it said, but couldn't find it.
1.) Look in the Merck index or online to find the toxicity of oil of wintergreen (methyl salicylate) for rats, in mg/kg of body mass.2.) How many grams of methyl salicylate would you personally... more
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04/17/19

General Chemistry
Calculate the enthalpy of formation of C12H26 (g), ΔHf, given the following information:2C12H26 (g) + 37O2 (g) → 24CO2 (g) + 26H2O (l) , ΔHf =-16,170.0 kJ/molH2O (l) , ΔHf = -285.8... more
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04/16/19

A gas has a volume of 750 mL at a pressure of 2.15 atm. What will the pressure be if the volume becomes 1.25 L?
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04/16/19

You are given 90.0 grams of fluorine with excess aluminum. How many grams will you produce

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04/16/19

If you are given 8.8x10^23 atoms of aluminum, how many liters of fluorine gas will you need to react with
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04/16/19

When graphing reaction rate over time, the slope of the graph describes the ___.
CatalystActivation energyLe Chatelier’s PrincipleInstantaneous rate
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04/16/19

What “rate of change” does a chemical reaction rate describe?
Change in pressureChange in volumeChange in molesChange in concentration
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04/16/19

A catalyst works by ____.
a) Reducing the activation energyb) Increasing the kinetic energy of the moleculesc) Providing a larger surface aread) None of the choicese) increasing the activation energy
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04/16/19

chem helppppppppp
What are the units of the rate constant for a first order reaction?
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04/16/19

How could you show experimentally that the molecular formula of propene is C3H3 , not CH2
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04/16/19

which of the following statements are true about equilibrium systems?
 True False  For the following reaction at equilibrium:                      CaCO3(s) ⇌ CaO(s) + CO2(g)                      adding more CaCO3 will shift the equilibrium to the... more
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