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miss Akunina [59]
3 years ago
5

Which statement is best described as a atom

Chemistry
1 answer:
myrzilka [38]3 years ago
6 0

a core of protons and neutrons surrounds by electrons

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The molecular weight of a gas that has a density of 5.75 g/l at stp is __________ g/mol.
Ira Lisetskai [31]

Answer : The molecular weight of a gas is, 128.9 g/mole

Explanation : Given,

Density of a gas = 5.75 g/L

First we have to calculate the moles of gas.

At STP,

As, 22.4 liter volume of gas present in 1 mole of gas

So, 1 liter volume of gas present in \frac{1}{22.4}=0.0446 mole of gas

Now we have to calculate the molecular weight of a gas.

Formula used :

\text{Moles of gas}=\frac{\text{Mass of a gas}}{\text{Molecular weight of a gas}}

Now put all the given values in this formula, we get the molecular weight of a gas.

0.0446mole=\frac{5.75g}{\text{Molecular weight of a gas}}

\text{Molecular weight of a gas}=128.9g/mole

Therefore, the molecular weight of a gas is, 128.9 g/mole

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3 years ago
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Magnesium (Mg): 1s22s22p63s2<br><br> longhand notation<br><br> noble-gas notation
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Answer: longhand notation

Explanation: I just did it on Edg

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According to rounding rules for addition the sum of 27.1, 34.538, and 37.68 is
Katena32 [7]
The answer should be...99.318!
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Mount St. Helens is a volcano that erupted with great force in 1980. Which phrase best describes this eruption?
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Answer:The best phrase which supports the eruption would be high-viscosity magma lava broken into fragments.

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What is the name of the compound with the formula NaOH ?
vladimir2022 [97]

Answer:

Sodium hydroxide

Explanation:

Sodium hydroxide ( NaOH ) -

Sodium hydroxide is an inorganic compound , and is also called caustic soda and lye .

It is an ionic compound , which is white in color and is in solid state .

The cation and anion of this salt are the sodium cation Na⁺  and the hydroxide anions OH⁻ .

<u>It is highly basic in nature and is soluble in water , and when left open in air it can readily absorb moisture from the air , to form a hydrated sodium hydroxide .</u>

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