02/15/21

At what pressure would 0.150 mole of nitrogen gas at -23.0 o C occupy 8.90 L?
If you can, please explain the steps.
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02/15/21

Boiling points: Alkanes VS Alkenes

Hello! This is my first time on Wyzant and I guess I'll be trying it out now. Anyways, I have a question: Why do alkanes generally have a higher boiling points than alkenes?I have tried googling,... more
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02/15/21

At 600 K, 0.250 mol N2(g) and 0.270 mol H2(g) were placed in a 2.00 L container. At equilibrium, the concentration of NH3(g) was 0.030 M. Calculate KC at 600 K for N2(g) + 3H2(g) ⇌ 2NH3(g).
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02/15/21

At 700 K, an equilibrium mixture of gases was found to contain 0.0215 M H2, 0.00158 M I2, and 0.0487 M HI. Calculate KC for H2(g) + I2(g) ⇌ 2HI(g) at 700 K.
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02/15/21

At 377 °C, KC = 0.0111 M for PCl5(g) ⇌ PCl3(g) + Cl2(g).

At 377 °C, KC = 0.0111 M for PCl5(g) ⇌ PCl3(g) + Cl2(g). Into a 2.00 L flask are placed 0.120 mol PCl5, 0.0600 mol PCl3, and 0.0400 mol Cl2. Are the contents of the flask at equilibrium? If not,... more
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02/15/21

Chemistry hw Help
A gas is initially at STP, calculate the final temperature if the pressure changed to 199KPa. Name the law used
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02/15/21

Chemistry hw Help
A gas initially at pressure of 250KPa and 67L. What would be the final pressure if the volume change at 45L. Name the law used.
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02/15/21

Chemistry hw Help
Calculate the initial number of moles at 77L if the number of moles changed to 5.43 at 86L. Name the law used 
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02/15/21

density of block
The sides of a certain rectangular wood block were measured 0.1294 meters, 7.41 centimeters and 9.4 millimeters. The mass of the block was measured to be 55.917 grams on an analytical balance.... more
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02/14/21

The question is a picture in the description box

This is the question for u please help me answer   42g/mol C2H6   32g/mol O2 44g/mol CO2 18g/mol H2O2 C2H6 + 7 O2 → 4 CO2 + 6 H2O193.2 g C2H6 reacts with 500g of oxygen. What is the mass of CO2... more
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02/14/21

Chem Conversions

An ice freezer behind a restaurant has a freon leak, releasing 33.03g of  C2H2F3Cl into the air every week. If the leak is not fixed, how many kilograms of fluorine will be released into the air... more
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02/14/21

Calculate the freezing point of a solution when 370 grams of Ca3(PO4) is added to 3000mL of water.
Calculate the freezing point of a solution when 370 grams of Ca3(PO4) is added to 3000mL of water. (density of water is 1.00 g/mL). The Kf for water is 1.86°C/m and normal freezing point of water... more
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02/14/21

How long will it take for the concentration of A to decrease from 0.850 M to 0.327 for the reaction A → Products? (k = 0.0882 M⁻¹s⁻¹)
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02/14/21

How can I find the concentration of ions in a molar solution?
For example, 278 g of CaCl2 is dissolved in 2 liters of water, what is the concentration of the Ca2+ ions and the concentration of the Cl- ions?
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02/14/21

How many molecules are in a mole of caffeine?

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02/14/21

Equilibrium Concentration problem providing initial concentration of 2 reactants
For the reaction below, Kc = 1.10 × 10⁻⁴. What is the equilibrium concentration of C if the reaction begins with 0.200 M A and 0.750 M B? 2 A (aq) + B (aq) ⇌ C (aq)
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02/14/21

2MnO4- + 5H2S+ 6H+ ----> 2Mn2+ + 5S+ 8H2O. The oxidation state of manganese changes from what to what? How many electrons are transferred in the reaction?
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02/14/21

Write a net ionic equation for the reaction that occurs when aqueous solutions of nitric acid and sodium hydroxide are combined
Be sure to specify states such as (aq) or (s).
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02/14/21

how do you convert mL to mmol?
im having issues setting up the conversions.. and issues with knowing where to put the liters portion in the conversion table.Need to find how much mmol is in concertion of 0.30 M Pb 2+ in 5... more
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02/13/21

Calculate the [H+] and pH of a 0.000173 M acetic acid solution. Keep in mind that the Ka of acetic acid is 1.76×10^−5.

Calculate the [H+] and pH of a 0.000173 M acetic acid solution. Keep in mind that the KA of acetic acid is 1.76×10^−5.This is a problem that will require you to use the quadratic. Start by setting... more
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02/13/21

How many potassium atoms would there be in133 mg of potassium
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02/13/21

how will you prepare the stock solution and many mls will administer to this group
A group containing 5 rats in an analgesic experiment are to be administer equal volume ibuprofen analgesic at 400mg/kg. If the laboratory instructor directed you to use a 50mg/ml solution, how will... more
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02/12/21

I keep getting lost on this question: In a combination reaction, 1.54 g of lithium is mixed with 6.56 g of oxygen.....
a) Which reactant is present in excess? I got Lithium being the LR. b) How many moles of the product are formed?I got 3.32 g Li2Oc) After the reaction, how many grams of each reactant and product... more
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02/12/21

need chemistry help
In the balanced equation, how many grams of lithium carbonate are produced from .66 moles of lithium phosphate and excess iron (II) carbonate?3 FeCO3 + 2 Li2PO4 —> 3 Li2CO3 + Fe3(PO4)2
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02/12/21

calories to heat 6.5 g of water from 15 ∘C to 32 ∘C
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