Which type of reaction releases the greatest amount of energy per mole of reactant?(1) combustion (2) decomposition (3) nuclear fusion (4) oxidation-reduction

The correct answer is physical change does not change the chemical formula of the substance.

What is a physical change?

• A physical change is one in which only the physical state of matter is altered.
• Its chemical characteristics have not changed.
• A physical change is usually brought about by increasing the temperature or exerting pressure, or both.
• The original state of matter is restored by reversing the condition, that is, lowering the temperature, lowering the pressure, or both.
• Physical changes, in other words, are reversible.

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Answer:

B.  a physical change does not change the chemical formula of the substance

Explanation:

Physical change does not change the substance or identity of an object

Answer: A) 149.10 g/mol

Explanation:

First, I list what I know, which are the molar masses of N, H, P, and O:

N = 14.01 g/mol
H = 1.01 g/mol
P = 30.97 g/mol
O = 15.99 g/mol

Now, I determine how many molecules of N, H, P, and O there are, starting with (NH₄)₃:

With just NH₄, there would be 1 N and 4 H, but since there are () around it with a subscript of 3, we multiply 3 by both N and H₄, so:

1*3 = 3 N
1*12 = 12 H

Now, we look at PO₄:

The subscript of 3 is before PO₄, so we do not apply that to PO₄:

1 P
4 O

Now, we know the molar masses and number of each of the elements, so we can determine the molar mass of the entire compound.

First, I calculate the total molar masses of each of the elements by multiplying the number of molecules of the element by the element's molar mass:

3 N = 3*14.01 g/mol = 42.03 g/mol
12 H = 12*1.01 g/mol = 12.12 g/mol
1 P = 1*30.97 g/mol = 30.97 g/mol
4 O = 4*15.99 g/mol = 63.96 g/mol

Then, I calculate the total molar mass of the compound by adding the total molar masses of each of the elements together:

42.03 + 12.12 + 30.97 + 63.96 = 149.08 g/mol

I probably used slightly different approximations of the molar masses of each element, but my answer is closest to choice A) 149.10 g/mol.

So, if there are no () around a compound, like PO₄, the subscript only applies to the element it's attached to, so there are 4 molecules of O and only 1 molecule of P.

If there are () around a compound with a subscript, like (NH₄)₃, the subscript after the () gets applied to each element inside the ().

I hope this helps! :)

Final answer:

The molar mass of the compound (NH₄)₃PO₄ is calculated by adding up the molar masses of all its constituent elements. The calculated molar mass is approximately 149.09 g/mol, which corresponds to answer choice (A) 149.10 g/mol.

Explanation:

To calculate the molar mass of a compound, you multiply the quantity of each element by its atomic mass and then sum them all up. The formula (NH₄)₃PO₄ contains Nitrogen (N), Hydrogen (H), Phosphorous (P), and Oxygen (O). The atomic masses of these elements are approximately 14.01 g/mol, 1.01 g/mol, 30.97 g/mol, and 16.00 g/mol respectively. So for the compound (NH₄)ᵣPO₄, the molar mass would be as follows:

(3*N) + (12*H) + (1*P) + (4*O) = (3*14.01) + (12*1.01) + 30.97 + (4*16.00) = 149.09 g/mol approximately

Therefore, the closest answer choice to the correct molar mass is (A) 149.10 g/mol.

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Explanation:

As we all know that like disolves in like solvent.

Here both water and Ethanol are polar. Hence Ethanol soluble in water.

Moreover, both forms intermolecular hydrogen bonds. It enhances the solubility of ethanol.

Both water and Ethanol are called as associate liquids. Hence solubility is more.

Alcohols have higher boiling point than other hydrocarbons due to their polarity and from the fact that they form very strong intermolecular hydrogen bonding. This is due to the large difference in their electronegativity that forms between the oxygen and the hydrogen atom. 

Answer : The mass of magnesium oxide produced will be, 161.2 g

Solution : Given,

Mass of Mg = 97.2 g

Mass of = 88.5 g

Molar mass of Mg = 24.3 g/mole

Molar mass of = 32 g/mole

Molar mass of MgO = 40.3 g/mole

First we have to calculate the moles of Mg and .

The balanced reaction is,

As, 2 moles of Mg react with 1 moles of

So, 4 moles of Mg react with moles of

From this we conclude that the is in excess amount and Mg is in limited amount.

Now from the reaction we conclude that

As, 2 moles of Mg react to give 2 moles of MgO

So, 4 moles of Mg react to give 4 moles of MgO

Now we have to calculate the mass of MgO.

Therefore, the mass of magnesium oxide produced will be, 161.2 g

Another name for cytosol is cytoplasmic matrix. This fluid can be found inside cells. It has to do with how the cell's organelles are held in suspension.

Numerous crucial metabolic processes occur in the cytosol, which also serves as a conduit for the movement of chemicals and ions throughout the cell. It offers a dynamic setting that supports the cellular machinery and enhances the cell's overall functionality. The term "cytoplasmic matrix" refers to the fluid-like substance (cytosol) that provides the cytoplasmic organelles and molecules with their structural support.

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