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3 years ago

Which species contains the lowest number of electrons

Chemistry

1 answer:

ioda3 years ago

5 0

The element that contain the lowest number of electrons is Hydrogen

explanation

Hydrogen is in atomic number one in periodic table. hydrogen been in atomic number one this implies that it has the lowest number of electron since it has an only one electrons.

Protium the most common isotope of hydrogen consist only one electron.

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Calculate the mass (in grams) of methylene bluecrystals that you must weigh in order to make 100.0mL of 1.25 × 10-5mol/L methyle

mario62 [17]

Answer: The mass of methylene blue that must be weighed is $3.99\times 10^{-4}g$

Explanation:

To calculate the mass of solute, we use the equation used to calculate the molarity of solution:

$\text{Molarity of the solution}=\frac{\text{Mass of solute}\times 1000}{\text{Molar mass of solute}\times \text{Volume of solution (in mL)}}$

We are given:

Molarity of solution = $1.25\times 10^{-5}M$

Molar mass of methylene blue = 319.85 g/mol

Volume of solution = 100.0 mL

Putting values in above equation, we get:

$1.25\times 10^{-5}M=\frac{\text{Mass of methylene blue}\times 1000}{319.85\times 100.0}\\\\\text{Mass of methylene blue}=\frac{1.25\times 10^{-5}\times 319.85\times 100.0}{1000}=3.99\times 10^{-4}g$

Hence, the mass of methylene blue that must be weighed is $3.99\times 10^{-4}g$

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3 years ago

Complete the sentence

solmaris [256]

Answer:

Explanation:

physical change

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3 years ago

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Naturally occurring copper has two isotopes, 63cu and 65cu. what is different between atoms of these two isotopes?

GaryK [48]

The differences are the number of neutrons and the atomic mass.

Copper-63 has an atomic mass of 63 amu, and has 34 neutrons.
Copper-65 has an atomic mass of 65 amu, and has 36 neutrons.

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3 years ago

Find the mass of 5.60 mol NaOH

olga_2 [115]

The mass is 224 grams of NaOH

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Help please I really need it. :(

stich3 [128]

Answer:

the second answer

Explanation:

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