Answer:
We love the noble gases. Some scientists used to call them the inert gases. It didn't really work because there are a few other gases that are basically inert but not noble gases. Nitrogen (N2) might be considered an inert gas, but it is not a noble gas. The noble gases are another family of elements, and all of them are located in the far right column of the periodic table. For all of you budding chemists, the far right is also known as Group Zero (Group 0) or Group Eighteen (Group XVIII). This family has the happiest elements of all.
Explanation:
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The number of molecules that are needed in a 23.45 g sample of copper (ii) hydroxide, are 1.45 x 10²³.
<h3>What is Avogadro's number?</h3>
Avogadro's number is the measurement of the one mole of any substance that is equal to the Avogadro's number.
Avogadro's number is 6.022 × 10²³.
To calculate the moles
Moles = mass / molar mass
Mass is 23.45 g
Molar mass is 97.562
Putting the value in equation
Moles = 23.45 g/ 97.562 = 0.24 mol.
The moles of copper (II) hydroxide has been 0.24 mol.
The number of molecules in 0.24 mol sample has been driven by:
1 mol = 6.022 × 10²³.
0.24 mol = 0.24 x 10²³.
0.24 mol = 1.45 x 10²³.
Thus, the number of molecules that are needed in a 23.45 g sample of copper (ii) hydroxide, are 1.45 x 10²³.
Learn more about Avogadro's number
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Answer:
3.40x10¹⁰ grams
Explanation:
First we<u> convert 5.25x10³² atoms to moles</u>, using <em>Avogadro's number</em>:
5.25x10³² atoms ÷ 6.023x10²³ atoms/mol = 88.72x10⁸ mol
Then we<u> convert K moles to grams</u>, using its <em>molar mass</em>:
88.72x10⁸ mol * 39 g/mol = 3.40x10¹⁰ g
So 5.25x10³² atoms of K would weigh 3.40x10¹⁰ grams.
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