Chemistry - October 2007

Calculate the equilibrium partial pressures of SO2, O2, and SO3 produced from an initial mixture in which PSO2 = PO2 = 0.50 atm and PSO3 = 0.
PSO2=
PO2=
PSO3 =

2007-10-17 13:34:28 · 2 answers · asked by Joshua K 1

2007-10-17 13:34:26 · 1 answers · asked by Angel 1

In an experiment carried out at 258°C, a certain amount of NH4OCONH2 is placed in an evacuated rigid container and allowed to come to equilibrium. Calculate the total pressure in the container at equilibrium.

2007-10-17 13:33:42 · 1 answers · asked by Joshua K 1

Given the following data:
CaO(s) + CO2(g) → CaCO3(s) ΔH = -178.3 kJ
2Ca(s) + O2(g) + 2CO2(g) → 2CaCO3(s) ΔH = -1626.9 kJ

Find the ΔH of the following reaction:
2Ca(s) + O2(g) → 2CaO(s)

Given the following data:
S(s) + O2(g) → SO2(g) ΔH = -296.8 kJ
CS2(l) → C(s) + 2S(s) ΔH = -89.4 kJ
CO2(g) → C(s) + O2(g) ΔH = +393.5 kJ

Find the ΔH of the following reaction:
CO2(g) + 2SO2(g) → CS2(l) + 3O2(g)

Thank you before hand

2007-10-17 13:30:01 · 1 answers · asked by vivachappelle 2

Strong hydrogen bonds can occur between which pairs of elements?
I) O and N
II) H and N
III) H and O
IV) H and C
V) H and F

1. I, II, III, IV and V
2. II and III only
3. I, III and V only
4. II, III, IV and V only
5. II, III and V only

2007-10-17 13:23:23 · 4 answers · asked by Anonymous

The question is as follows:

What volume of ethylene glycol (C2H6O2), a nonelectrolyte, must be added to 12.0 L of water to produce an antifreeze solution with a freezing point of -24.0°C? (The density of ethylene glycol is 1.11 g/cm3, and the density of water is 1.00 g/cm3.)

I keep getting an answer of 10.8 L, and WebAssign keeps telling me I am wrong.

Also, there is a part II to the Question, asking what the boiling point is to the solution. If anyone could help me with that, it'd be great.

I am not neccesarily looking for answers (though they'd be appreciated), just an explanation for how to find them. Thanks!

2007-10-17 12:23:08 · 1 answers · asked by undzeichnete 1

The total volume of hydrogen gas needed to fill the Hindenburg was 2.00 x 108 L at 1.00 atm and 25.0°C. How much energy was evolved when it burned?
H2(g) + (1/2)O2(g) H2O(l), change in H = -286 kJ

2007-10-17 12:00:29 · 1 answers · asked by khanh1023 1

Identify the hybridization of the carbon atom(s) in CN-

Also give the number of π bonds in the molecule or ion

An example of an answer would be: sp3 2 meaning the hybrid orbital on C is sp3 and there are two pi bonds. This would be a wrong answer though, if you think about it.

2007-10-17 11:58:54 · 1 answers · asked by physicsisgay 2

consider the reaction
C2H5OH(l) + 3O2(g) 2CO2(g) + 3H2O(l); change in H = -1.37 x 103 kJ

Consider the following propositions:
I. The reaction is endothermic.
II. The reaction is exothermic.
III. The enthalpy term would be different if the water formed was gaseous.

Which of these propositions is (are) true?

2007-10-17 11:58:42 · 2 answers · asked by khanh1023 1

I need help with nomenclature naming, is there an easy way to memorize binary, and polyatomic ions, and recognize the suffix ending? Why is HCLO hypoclourous acid and HCLO4 perchloric acid? WHY THE HYPO?

2007-10-17 11:58:38 · 2 answers · asked by Anonymous

2007-10-17 11:55:15 · 3 answers · asked by Anonymous

SF6 and NO2^-1 please and thank you. Im stuck on these two.

2007-10-17 11:52:15 · 1 answers · asked by Anonymous

2007-10-17 11:44:19 · 1 answers · asked by Anonymous

2007-10-17 11:29:55 · 1 answers · asked by Anonymous

On which quantum numbers does the energy of an electron depend in each of the following:
a. a one-electron atom or ion
b. an atom or ion with more than one electron

2007-10-17 11:21:26 · 1 answers · asked by Nhat t 1

2007-10-17 11:20:37 · 1 answers · asked by Praggy 1

What is the maximum number of electrons in an atom that can have the following quantum numbers?
(a) n = 2, ms = -1/2

(b) n = 5, l = 3

(c) n = 2, l = 1, ml = -1

(d) n = 3, l = 2, ml = +1

2007-10-17 11:13:33 · 1 answers · asked by ya boi 2

I know that they are very common such as having 4 valence electrons but in 8th grade language could you explain to me what else they have in common?

2007-10-17 10:50:09 · 2 answers · asked by dothemooshoo247 3

2007-10-17 10:45:27 · 5 answers · asked by Unknown 1

2007-10-17 10:44:01 · 2 answers · asked by cheshirecat192 3

How much solid NaCN must be added to 1.0 L of a 0.5 M HCN solution to give a pH of 7.0? (Assume Ka = 6.2 x 10-10 for HCN.)

A. 0.0034 g
B. 11 g
C. 160 g
D. 24 g
E. 0.15 g

2007-10-17 10:40:54 · 1 answers · asked by ChemChic 1

A 90.0 L stainless steel container was charged with 4.00 atm of hydrogen gas and 5.00 atm of oxygen gas. A spark ignited the mixture, producing water. What is the pressure in the tank at a constant temperature of 25°C?

2007-10-17 10:35:54 · 1 answers · asked by Anonymous

A 10.0-g sample of a mixture of CH4 and C2H4 reacts with oxygen at 25.0 degrees C and 1.00 atm to produce CO2(g) and H2O(l). If the reaction produces 519 kJ of heat, what is the mass percentage of CH4 in the mixture?

2007-10-17 10:10:43 · 1 answers · asked by Anonymous

emitted is cold rather than warm or hot?

2007-10-17 09:42:33 · 4 answers · asked by adrian s 1

What is the volume of a mixture of 23.0 g of N2 and 26.5 g of O2 at 47.0°C and 850. mm Hg? Assume the gases do not react with each other.

2007-10-17 09:38:42 · 1 answers · asked by RK 2

Zn + 2 HCl ---> ZnCl2 + 2 H

Show mathematically how the data below can be used to confirm or deny the above chemical equation. Please explain in depth.

Zinc / HCl Titration Experiment
Moles of HCl added: .0502
Grams Zinc: .195
Initial Buret Reading: 4.00
Final Buret Reading: 25.80
Volume of NaOH used: 21.20
# Moles NaOH added: .0411
# Moles HCl titrated: .0411

2007-10-17 09:18:50 · 1 answers · asked by Anonymous

between group 14,15, and 16 there is a patern between the boiling points with the boiling point being higher for the higher group- but group 17 dosn't fit the pattern it has lower boiling point then group 15 - why? As well how do you explain the anomalies such as water?

2007-10-17 08:58:16 · 1 answers · asked by stevenback0 2

Which of the following is the least reactive?

calcium

magnesium

radium

strontium

barium

2007-10-17 08:57:36 · 3 answers · asked by Anonymous

Do the charges of an atom effection ionization energy and electron affinity? If they do, how so?

For instance, Cl-, Cl+ or CL. Which would have the great ionization energy or electron affinity?

Thanks

2007-10-17 08:27:26 · 1 answers · asked by thunderbomb90 3

Ok, need to design a chemical experiment. I'm given certain amount of water at an unknown temperature and a thermometer that only goes to 40 degrees C. I have a chem lab at my disposal (grad cylinders, 0.001g wieghts, ect) I must find the tempurature of the water. I can use additional water, ice, ect. I need a straighforward way to do this, and record my data. Can I do it using Moles? what equations would I need? is there a way to do it otherwise? Thanks!

2007-10-17 08:20:25 · 3 answers · asked by colorsonfriday 2