02/11/21

Use the standard enthalpies of formation to determine ΔH∘rxn for the following chemical equation: 2 H2 (g) + O2 (g) →2 H2O (l)
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02/05/21

please can i actually please receive help because i have been stuck for many hours
Question 1: 3 Cu  +   8HNO3  --> 3 Cu(NO3)2   +  2 NO  +  4  H2OIn the above equation how many moles of water can be made when 36 moles of HNO3 are consumed?Question 2: Sodium chlorate... more
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02/05/21

For the reaction below, Kc = 9.2 × 10⁻⁵. What is the equilibrium concentration of D if the reaction begins with 0.30 M A?
A (aq) + 2 B (s) ⇌ C (s) + 2 D (aq)
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02/04/21

Consider the following balanced chemical equation: Fe2O3 + 3CO → 2Fe + 3CO2 To produce 5.0 moles of CO2, _____ moles of Fe2O3 are required.
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02/04/21

mixed stoichiometry

One of the decomposition products of ammonium nitrate can be dinitrogen monoxide. How many milliliters of dinitrogen monoxide gas at STP are made from the decomposition on 0.75 grams of ammonium... more
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02/04/21

Calculate the heat required to melt 25.7 grams of solid water at 0 ºC.

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02/04/21

Calculate the amount of heat (in J) required to completely condense 50 g of oxygen at -183 ºC.
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02/02/21

Chemistry (Gas)
When hydrogen peroxide reacts with bleach (sodium hypochlorite), a very explosive reaction takes place. If 3 mL of a 0.45 mol/L solution of hydrogen peroxide reacts with 4 mL of a 0.32 mol/L... more
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02/02/21

Sixteen grams of O2 can produce how many grams of water?
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02/02/21

Chemistry help Ideal Gases
Calculate the moles of gas that has a pressure of 0.32atm at 45L volume and 440K of temperature. Which value of R will you use and what unit. Justify your answer.
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02/02/21

A certain oxide of vanadium is 32.02% oxygen by mass. Determine the empirical formula of this compound.
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02/02/21

Does NHF2 have LDFS?
Does NHF2 have London dispersion forces?
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01/20/21

Unit 5 Quiz Review
Calculate the empirical formula for a compound that, through experimental analysis was found to contain 2.20g sulfur and 7.81g fluorine.  ____ g S =  =         ____ g... more
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01/20/21

Chemical Reactions
Not all chemical reactions can be represented by net ionic equations. Why can you not write a net ionic equation to show what happens in the following reaction:Carbonic acid (H2CO3(aq)) decomposes... more
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01/20/21

Unit 5 Quiz Review

Find the percent of barium in barium phosphate (all numbers are to have 2 decimal places)._____g  / ______g   x  _______%  = _______%Please answer and explain.
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01/19/21

How many grams of aluminum will be needed
How many grams of aluminum will be needed to react to 50g of iron (III) oxide needs to fully react wit the equation FE2O3 + 2AI(S) = AI2O3(S) + 2 Fe (S)
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01/19/21

chemistry 2 question 3
how many moles of ethylene glycol (C2H6O2) should be added to 25.0 moles of water to make a solution with a vapor pressure of 17.5 torr? the vapor pressure of pure water is 23.8 torr. you can... more
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01/19/21

How many ppm of lead are there if 0.2 g of lead is found in 50 L of water?
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01/19/21

How many grams of Li3N are produced when 25 grams of N2 react with excess Li?
Balanced form: 6 Li + N2 = 2 Li3N
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01/17/21

Chemistry gas laws
A sample of potassium chlorate placed in a 20.0-L container decomposes to form potassium chloride and oxygen gas.2KClO3(s) → 2KCl(s) + 3O2(g)If the sample contained 2.0 moles of KClO3 at a... more
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01/15/21

4.2 moles of KOH equals how much mass
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01/15/21

In this experiment is it necessary to decompose all of the KClO₃? Why or why not?
I really need help with this Ideal gas law lab
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01/13/21

Imagine the room it has Height =20 m Temperature =273 k Pressure=5 atm Volume fraction of oxygen in air is 21%. Calculate the mass of oxygen in room.
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01/13/21

Calculate the enthalpy change when ammonia gas will be formed
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01/12/21

I'm new to chemistry and I need help with this
A chemist starts with a 50.0 mL sample of 0.265 M propanoic acid, HC3H5O2, then adds 0.496 g of sodium propanoate, NaC3H5O2.1.Explain how this creates an effective buffer.2.Propanoic acid has an... more
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