Limestone is primarily a crystal form of caco 3 . How many moles of oxygen are in a 1.25 mol sample of caco 3 ? Only include the numerical value in your answer. Do not include units.

Answers

Answer 1

Answer:

There are 3.75 moles of oxygen in a 1.25 mol sample of CaCO₃.

Limestone is primarily a crystal form of CaCO₃ (calcium carbonate). According to its chemical formula, the molar ratio of CaCO₃ to O is 1:3. The moles of oxygen in 1.25 moles of CaCO₃ are:

$1.25 mol CaCO_3 * (3molO)/(1molCaCO_3) = 3.75molO$

There are 3.75 moles of oxygen in a 1.25 mol sample of CaCO₃.

You can learn more about molar ratios here: brainly.com/question/9408497

Answer 2

Answer:

As the molecular formula of CaCO₃ suggested, that there are 3 moles of oxygen are there in 1 mole of CaCO₃.

So in 1.25 mol of CaCO₃ contains=1.25 ×3 moles of oxygen

=3.75 moles of oxygen

So there are 3.75 moles of oxygen are there in 1.25 mol of CaCO₃.

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Two very stable compounds, Freon-12 and Freon-14, are used as liquid refrigerants. A Freon-12 molecule consists of one carbon atom, two chlorine atoms, and two fluorine atoms. A Freon-14 molecule consists of one carbon atom and four fluorine atoms.81 In the space in your answer booklet, draw a structural formula for Freon-12. [1]

82 To which class of organic compounds do Freon-12 and Freon-14 belong? [1]

Answers

81. There is 1 carbon, 2 chlorine and fluorine atoms in Freon 12. To draw them it forms a cross with C in the middle and Cl and F both on the opposite side.
Cl
l
F - C- F
l
Cl

82. Freon-12 and Freon-14 are called halocarbons or just halides.

Answer:

- The structural formula for Freon-12 (CCl2F2)

Cl - C - Cl

It has the same structure as methane (CH4) with Hydrogen atoms replaced by Chlorine and Fluorine

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In what respect does an atom of magnesium differ from a magnesium ion (Mg^{2+})? (A)The ion has a more stable electronic arrangement than the atom.
(B)The positive charge on the nucleus of the ion is two units greater than the nuclear charge on the atom.
(C)The ion has two more protons than the atom.
(D)The ion will react more readily with free Cl₂.
(E)The ion has two more planetary electrons than the atom.
Can anyone explain this one?

Answers

both b and d are correct however the ion reacts more readily to a number of different elements. not just Cl2 so the best correct answer is b: the positive charge on the nucleus of the ion us two units greater than the nuclear charge on the atom.

During an experiment, a student observes the formation of a precipitate. Why does this indicate that a chemical reaction is likely occurring?

Answers

The formation of a precipitate is always caused by a chemical reaction between a liquid solution and a precipitant. When solid particles suddenly appear in a sample of liquid under experimentation, that is an obvious sign that a reaction has occurred. Precipitates possess various qualities such as color and size. The only exception to this is when a precipitate forms when solubility of a solute is exceeded.

Answer:

A solid forms, and there is a change of color.

Explanation:

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Answers

Answer:

17 atoms are in 3(SO)4

Explanation:

Final answer:

There are 15 total atoms in $3(SO)4.$

Explanation:

To find the total number of atoms in a chemical formula like 3(SO)4, you need to multiply the subscripts (the numbers outside the parentheses) by the number of atoms represented by each element within the parentheses and then multiply that by the coefficient (the number outside the formula).

In this case, you have:

$3(SO)4.$

Now, let's break it down:

The subscript for sulfur (S) is 1.

The subscript for oxygen (O) is 4.

So, for each (SO4) unit, you have 1 sulfur atom and 4 oxygen atoms.

Now, multiply this by the coefficient of 3:

$3(SO)4.$ = 3 * (1 sulfur atom + 4 oxygen atoms)

= 3 sulfur atoms + 12 oxygen atoms

So, in $3(SO)4.$ , there are a total of 3 sulfur atoms and 12 oxygen atoms, for a combined total of 15 atoms.

Learn more about Atoms here:

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Answers

Zn(OH)4= ; -2 = -4 + ?, Zn = +2 , the -4 is the charge on the 4 OH- ions.

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( Zn + 4 OH- ----> Zh(OH)4= + 2e-) x 4
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