Chemistry - April 2007

Ammonium carbamate (NH2COONH4) is a salt of carbamic acid that is found in the blood and urine of animals. At 250.0 °C, Kc = 1.58×10-8 for the following equilibrium:

NH2COONH4(s) <=> 2NH3(g) + CO2(g)

If 2.68 g NH2COONH4 is introduced into a 0.500 L evacuated container, what is the total pressure inside the container at equilibrium?

2007-04-24 11:16:54 · 1 answers · asked by socr8711 2

a) H2SO4 and HSO4-
b) H3O+ and OH -
c) HClO and HCl
d) HCl and Cl -
e) HF and F -

there may be more than one answer

2007-04-24 10:54:35 · 1 answers · asked by kcc 1

a) H2


b) Cl2


c) Al


d) MnO4-


e) C

there may be more than one answer.
I already tried choices ac and ae and they were both wrong. PLZ help me ASAP

2007-04-24 10:49:55 · 2 answers · asked by kcc 1

What volume of 0.470 M HCl is needed to react with 1.95 g of aluminum hydroxide?

2007-04-24 10:45:31 · 2 answers · asked by wonderer 1

What volume of 0.130 M NaOH is needed to react with 94.0 mL of 0.240 M phosphoric acid?

2007-04-24 10:43:41 · 3 answers · asked by wonderer 1

A solution of Ca(OH)2 has a measured pH of 9.60. What is the molar concentration of the Ca(OH)2 in the solution?

2007-04-24 10:41:04 · 2 answers · asked by wonderer 1

2007-04-24 10:16:33 · 1 answers · asked by Scott S 1

If a plutonium 239 atom undergoes an alpha decay due to its instability, what new element would be produced?

I am looking for how to do it not an answer but if you need to give an answer to better explain go right ahead

Please I am begging for help here... no silly answers please! If you can explain it a little I would be soooo grateful!
THANKS IN ADVANCE!!!!!!!

2007-04-24 10:03:51 · 2 answers · asked by .j,kjhgd,jghf 2

Nitric acid is an important acid used inmaking fertilizers, dyes, and explosives, among other things. The first step in the industrial production process is the oxidation of ammonia:
4NH3 (g) + 5O2 (g)------> 4NO (g) + 6H2O (g) Calculate the Heat of Reaction value, from Heat of Formation values:
NH3 (g)= -45.9 kJ: O2 (g)= 0 kJ; NO (g)= 90.3 kJ; H2O (g)= -241.8 kJ

2007-04-24 09:55:51 · 1 answers · asked by Sherline 1

2007-04-24 08:49:15 · 2 answers · asked by Nurse2b 1

2007-04-24 08:48:21 · 2 answers · asked by Nurse2b 1

What mass of aluminum chloride (133.33 g/mole) can be produced by reacting 4.0 mols of aluminum (26.98 g/mol) with hydrochloric acid (36.46 g/mol)?

2Al+ 6HCl yeilds 2AlCl3 + 3H2

2007-04-24 08:42:28 · 2 answers · asked by Cameron 1

NOTE: the answer should be a positive number

2007-04-24 08:35:38 · 1 answers · asked by Anonymous

My art teacher was giving us a lecture on plasma cutting and he said the pilot is hotter than the sun's surface. Is this true?

2007-04-24 08:35:36 · 4 answers · asked by Dan 5

What mass of hydrogen gas (2.016 g/mol) can be produced by reacting 6.0 mols of aluminum (26.98 g/mol) with hydrochloric acid (36.46 g/mol)?

2Al+ 6HCl yeilds 2AlCl3 + 3H2

2007-04-24 08:32:18 · 4 answers · asked by Cameron 1

2007-04-24 08:30:20 · 8 answers · asked by Lamarc T 1

Coursework time grrrrr. Any help wud be appreciated. I have done my research i just wanna c what othr ppl get
1) determine the conc of hydrogen peroxide by titration, h2o2 is 20 volumes
2) Sow that it is first order in the decompostion of H2O2

2007-04-24 08:30:04 · 1 answers · asked by Fia S 1

If the specific heat of water is 4.180 Jg -1°C -1, what mass of water can be heated from 5.0°C to 80.0°C by 27.0 kJ of heat?

2007-04-24 08:25:14 · 1 answers · asked by Anonymous

It doesn't seem like mace is really even used anymore.

2007-04-24 08:14:00 · 7 answers · asked by sir lunchbox 2

2007-04-24 07:49:31 · 6 answers · asked by kendra 1

2007-04-24 07:46:36 · 2 answers · asked by Anonymous

I've done an experiment with hydrochloric acid and magnesium ribbon, and in one of the questions I've been asked which is used as excess, I know what excess means but not sure I understand the question. Please can someone explain... The experiment was looking at the reaction rate with different concentrations of hydrochloric acid.

2007-04-24 07:41:45 · 3 answers · asked by Anonymous

2007-04-24 07:25:50 · 4 answers · asked by Clayton F 1

In a 1 Litre solution, 0.25 moles of acetic acid are mixed with 0.20 moles of sodium acetate. What is the pH of this solution?

2007-04-24 07:03:31 · 3 answers · asked by Richard A 2

2007-04-24 06:20:49 · 5 answers · asked by Consquela A 1

Write the ground state electron configurations of the following ions:

Au+ (I got [Xe] 6s2 4f14 5d8, told me I was wrong)
Ni2+ (I got [Ar] 4s2 3d6, told me I was wrong)
Mn2+ (I got [Ar] 4s2 3d3, told me I was wrong)
Zn2+ (I got [Ar] 4s2 3d8, told me I was wrong)

I have had no trouble with the anions, only the cations?
Why am I wrong and what are the correct answers, please?

2007-04-24 06:07:24 · 2 answers · asked by Anonymous

2007-04-24 05:52:29 · 4 answers · asked by Blue.. 1

2007-04-24 05:49:24 · 4 answers · asked by amber h 1

2007-04-24 04:29:26 · 3 answers · asked by prettypencils33 1

2007-04-24 04:28:51 · 2 answers · asked by max 1