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4 years ago

How many atoms of chromium are in 8.3 moles of aluminum dichromate

Chemistry

1 answer:

Varvara68 [4.7K]4 years ago

6 0

Answer:

3.00x10²⁵ atoms of chromiun

Explanation:

The formula of aluminum dichromate is Al₂(Cr₂O₇)₃.

In the formula it is seen that for each molecule of the compound, we have 6 chromium atoms, so in one mole of it, there are 6 moles of chromium. With this information you can calculate the amount of chromium atoms using Avogadro's number.

Since we know that in one mole there are 6.02x10²³ molecules of aluminum dichromate, and <em>in each molecule there are 6 chromium atoms</em>, so the following relationship can be established:

1 mole Al₂(Cr₂O₇)₃ _____ 6 x (6.02x10²³) Chrome atoms

8.3 moles _____ X = 3.00x10²⁵ atoms

Calculation:

8.3 moles x [6 x (6.02x10²³)] / 1 mol = 2.9979x10²⁵ atoms ≅ 3.00x10²⁵atoms

The answer, then, is that <em>there are 3.00x10²⁵ chromium atoms in 8.3 moles of aluminum dichromate</em>

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bogdanovich [222]

Answer:

Because the kind of compounds that you try to determine using paper chromatography (organic compounds) are usually not soluble in water. Furthermore, water could react chemically with some of this compounds, because it's a very reactive molecule. You need organic solvents that are mostly inert.

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3 years ago

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A sample of gallium bromide, GaBr3, weighing 0.165 g was dissolved in water and treated with silver nitrate, AgNO3, resulting in

melamori03 [73]

Answer:

%Ga by mass in sample of $GaBr_{3}$ is 23.0%

Explanation:

Molar mass of AgBr = 187.77 g/mol

So, 0.299 g of AgBr = $\frac{0.299}{187.77}$ moles of AgBr = $\frac{0.299}{187.77}$ moles of Br = 0.00159 moles of Br

Br in AgBr comes from $GaBr_{3}$

So, there are 0.00159 moles of Br in 0.165 g of $GaBr_{3}$

Molar mass of Br = 79.904 g/mol

So, mass of Br in 0.165 g of $GaBr_{3}$ = $(0.00159\times 79.904)g$ = 0.127 g

So, mass of Ga in sample of $GaBr_{3}$ = (0.165-0.127) g = 0.038 g

So, %Ga by mass in sample of $GaBr_{3}$ = [(mass of Ga)/(mass of $GaBr_{3}$ )] $\times 100$ %

= $\frac{0.038}{0.165}\times 100$ %

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3 years ago

A strong beam of light is directed toward a tank filled with water. What caused the beam of light to change direction?

Neporo4naja [7]

The bending occurs because light travels slower in a denser medium, which allows refraction. Since the light is passing from air (less dense) into water (more dense), it is bent more than normal.

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3 years ago

What type of rock forms when rocks melt, cool, and then harden?

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Explanation:

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3 years ago

Analysis of a sample of a compound composed of carbon, hydrogen, and oxygen shows that the sample contains 18.80 g of C, 2.367 g

Svet_ta [14]

Answer:

Analysis of a sample of a compound composed of carbon, hydrogen, and oxygen shows that the sample contains 18.80 g of C, 2.367 g of H, and 25.04 g of O.

The properties of the compound suggest that the molar mass should be 59.04 g/mol.

How many carbon atoms are there in one molecule of the compound?

Explanation:

Empirical formula mass is

$(12g/mol*2)+(1.0g/mol*3)+(16.0g/mol*2)\\=59.0g/mol\\$