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3 years ago

An unknown or changeable quantity is called a(n)...

Chemistry

2 answers:

Natali [406]3 years ago

7 0

<h2>Answer:</h2>

An unknown and changeable quantity is known as an variable.

<h3>Explanation:</h3>

There are two types of quantities:

Constant quantities:

Quantities which can not be changed by changing physical parameters and their value is normally known.

Variable quantities:

These quantities can be changed by changing the physical parameters or conditions. Due to which they are unknown for particular conditions and have to be measured.

givi [52]3 years ago

6 0

It is called a variable

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Oxidation number is defined as the total number of electrons that are gained or lost by the atom to form a chemical bond.
the oxidation number of the compound H₂S is 0.
the sum of the oxidation numbers of the individual elements should add up to the oxidation number of the compound.

(oxidation number of H x 2 H ions) + oxidation number of S = 0
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(+1 * 2 )+ (x) = 0
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4 years ago

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4 years ago

Calculate the volume of 1.00 x 10^-2M KOH solution containing 3.00 x 10^-1 mol of solute?

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Volume = ?

Molarity (M) = 1.00 x 10⁻² M

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4 years ago

How many grams of ethanol, CH3CH2OH, should you dissolve in water to make 0.800 L of vodka (which is an aqueous solution that is

Rashid [163]

Answer:

252.5g

Explanation:

Given parameters:

Volume of vodka = 0.8L

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Unknown:

Mass of ethanol = ?

Solution:

Molarity is one of the ways of expressing concentration. It is the number of moles of a substance in a solution.

Since Vodka = ethanol + water = solution

Molarity = $\frac{number of moles of ethanol}{Volume of solution}$

Number of moles of ethanol = molarity of vodka x volume of solution

Once we obtain the number of moles, we can derive the mass of the ethanol;

Number of moles = 6.86M x 0.8L = 5.49moles

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4 years ago

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Answer:

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