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Bingel [31]
3 years ago
15

How is a mole defined?​

Chemistry
2 answers:
mart [117]3 years ago
7 0

Answer:

The mole is the unit of amount in chemistry. ... A mole of a substance is defined as: The mass of substance containing the same number of fundamental units as there are atoms in exactly 12.000 g of 12C. Fundamental units may be atoms, molecules, or formula units, depending on the substance concerned.

Hope This Helps!  Have A Nice Day!!

sattari [20]3 years ago
6 0

A mole of a substance is defined as: The mass of substance containing the same number of fundamental units as there are atoms in exactly 12.000g of 12C. Fundamental units change depending on the substance.

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What is the pH of a 3.5 x 10-5 M solution of HCl?
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Answer:

pH = 4.45

Explanation:

We need to find the pH of 3.5\times 10^{-5}\ M solution of HCl. We know that, pH of a solution is given by :

pH=-log[H]^+

Put all the values,

pH=-log[3.5\times 10^{-5}]\\\\pH=4.45

So, the pH of the solution of HCl is 4.45.

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3 years ago
If the price of gasoline is $2.99 per U.S. gallon, what is the cost per liter? (1 L = 1.06 qt)
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Explanation: i
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If that is your picture, then the answer is that

Geometry A is trigonal planar
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Compound x is twice as soluble in diethyl ether as it is ethanol and is only sparingly soluble in water. compound y is soluble i
tatiyna

The question has mentioned three solvents: water, ethanol, and diethyl ether. Water is miscible with ethanol but not diethyl ether. As a result, it would be possible to separate a mixture of water and diethyl ether with a separatory funnel but not a mixture of water and ethanol using such techniques.

Substance X dissolves well in diethyl ether but not in water; substance Y dissolves well in water but not in diethyl ether. As a result, the two components of this mixture would end up in different layers when dissolved in a mixture of water and diethyl ether- which separate into two layers itself. One would expect to find

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Given the fact that diethyl ether has a density less than that of water (0.713 \; \text{g} \cdot \text{ml}^{-1} as opposed to 1.00 \; \text{g} \cdot \text{ml}^{-1},) it would form the upper layer of its mixture with water. Separate the mixture with a separatory funnel. The question stated that both X and Y are under the solid state while the two solvents are both liquidsm implying that the boiling points of both species are higher than that of their respective solvent. Therefore heat the solutions till all solvent had evaporated to obtain X and Y.

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3 years ago
5.) A spring with a spring constant of 500 n/m is stretched 1 meter in
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Answer:

250J

Explanation:

Given parameters:

Spring constant  = 500N/m

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Elastic potential energy  = ?

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