The concentration of a solution can be expressed in
(1) kelvins
(2) milliliters
(3) joules per kilogram
(4) moles per liter

The concentration of a solution can be expressed in (4) moles per liter

Stoichiometry in Chemistry learn about chemicals mainly emphasizes quantitative, such as the calculation of volume, mass, number, which is related to numbers, molecules, elements, etc.

In the reaction there are also manifestations of reagent substances namely gas (g), liquid (liquid / l), solid (solid / s) and solution (aqueous / aq).

The concentration of a substance can be expressed in several quantities such as moles, percent (%) weight / volume,), molarity, molality, parts per million (ppm) or mole fraction. The concentration shows the amount of solute in a unit of the amount of solvent.

Temperature is used as a guide to the level of heat energy from objects

Temperature cannot be measured by the surface of the hand because it is not accurate but can be measured by a thermometer. Temperature units include Celsius, Fahrenheit, Reamur or Kelvin

Volume is a derivative quantity derived from the length

The unit of volume can be expressed in liters or milliliters or cubic meters

Energy can be interpreted as the ability to do work

Energy units can be stated in joules or calories (J or Cal)

Mole

The mole itself is the number of particles contained in a substance amounting to 6.02.10²³

Mole is the result of dividing the amount of substance mass and its molar mass

Molarity is a way to express the concentration of the solution

Molarity shows the number of moles of solute in every 1 liter of solute or mmol in each ml of solution

Where

M = Molarity

n = Number of moles of solute

V = Volume of solution

So to find the number of moles can be expressed as

the concentrations for the two ions

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The molarity of the stock solution of luminol

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volume of 0.100 M Na₃PO₄

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i can ! i just need to know what the paragraph is! : p

2fe + 3h2so4 -> fe2(so4)3 + 3h2

it is necessary to balance equations in order to get the proper amount of reactants as well as products in order not to make a miscalculation.

you cannot change the subscripts as that would change the substance itself. for instance, diatomic elements such as h2 only have the subscript two when a gas. another example would be so4, if you were to change the subscript, the element would no longer be sulfate.

we change the coefficients instead as that only changes the number of molecules rather than the substance itself.

hope this !