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zaharov [31]
3 years ago
14

When ignited, solid ammonium dichromate decomposes in a fiery display. This is the reaction for a "volcano" demonstration. The d

ecomposition produces nitrogen gas, water vapor, and chromium(III) oxide. The temperature is constant at 25°C.
Substance H0f (kJ/mol) S0 (kJ/mol . K)


a. Cr2O3 (g) -1140 0.0812

b. H2O (I) -242 0.1187

c. N2 (g) 0 0.1915

d. (NH4)2 Cr2O7 - 22.5 0.1137
Chemistry
1 answer:
Lerok [7]3 years ago
4 0

Answer:

Your question is half unfinished, regarding the chromium III oxide the correct option that expresses the inorganic formula of said compound is "A"

Explanation:

In the reaction an initial salt reacts giving as product water vapor, nitrogen gas and an oxide that is chromium oxide.

Chromium oxide is an oxide that adopts the structure of corundum, compact hexagonal. It consists of an anion oxide matrix with 2/3 of the octahedral holes occupied by chromium. Like corundum, Cr2O3 is a tough, brittle material.

It is used as a pigment, green in color.

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A buffer of pH 9.24 is to be prepared from a weak acid and its salt. The best acid from which to prepare the buffer is
I am Lyosha [343]

Answer:

(C) arsenious acid, Ka = 6 x 10⁻¹⁰

Explanation:

A buffer is prepared by a weak acid and the conjugate base coming from its salt. Its function is to resist abrupt changes in pH when an acid or a base are added. The best working range of a buffer is in the range of pKa ± 1. Let's consider the 5 options and their pKa (pKa = -log Ka).

(A) phthalic acid, K1 = 1.3 x 10⁻³ (1st ionization)     pKa = 2.9

(B) hydrogen phthalate, K2 = 3.9 x 10⁻⁵                pKa = 4.4

(C) arsenious acid, Ka = 6 x 10⁻¹⁰                           pKa = 9

(D) formic acid, Ka = 1.8 x 10⁻⁵                               pKa = 4.7

(E) phenol, Ka = 1.3 x 10⁻¹⁰                                      pKa = 9.8

The acid whose pKa is closer to the desired pH is arsenious acid. Its working range of pH is 8 - 10. In the second place, phenol could work as a buffer system since the working pH range is 8.8 - 10.8.

5 0
3 years ago
What is the charge of that particle?<br> A). +e <br> B).-2/3 e<br> C).0<br> D).+2/3
Fynjy0 [20]
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5 0
3 years ago
assume that a water balloon has the same number of water molecules as a helium balloon has helium atoms. If the mass of the wate
Aloiza [94]

Answer : The mass of the water molecule is 4.5 times greater than the mass of the helium atom.

Explanation :

Assumption : The number of water molecules is equal to the number of helium atoms

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Now these two masses expression put in the equation (1), we get

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As per assumption, the number of water molecules is equal to the number of helium atoms. The relation between the mass of water molecule and the mass of helium atom is,

Mass of water molecule = 4.5 × Mass of helium atom

Therefore, the mass of the water molecule is 4.5 times greater than the mass of the helium atom.

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3 years ago
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Synthesis.  Which is "<span>Noun. (plural syntheses) The formation of something complex or coherent by combining simpler things. (chemistry) The reaction of elements or compounds to form more complex compounds.".....According to www.dictionary.com.</span>
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