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Vaselesa [24]
3 years ago
13

HELP PLEASE

Chemistry
1 answer:
zvonat [6]3 years ago
3 0

Answer:

Answer is D. Just took the quiz on A P E X

Explanation:

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The atom is one of the basic units of matter. Which part of the atom mostly determines the size of the atom?
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Answer:

Atomic size is the distance from the nucleus to the valence shell where the valence electrons are located. The separation that occurs because electrons have the same charge. The number of protons in the nucleus. The core electrons in an atom interfere with the attraction of the nucleus for the outermost electrons.

Explanation:

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4 years ago
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3 years ago
Calculate the moles of O atoms in 0.658 g of Mg(NO3)2.
lara31 [8.8K]

Answer:

There are 0.0267 moles of oxygen in 0.658 grams of magnesium nitrate.

Explanation:

Mass of magnesium nitrate = m = 0.658 g

Molar mass of magnesium nitrate = M = 148 g/mol

Moles of magnesium nitrate = n

n=\frac{m}{M}=\frac{0.658 g}{148 g/mol}=0.004446 mol

1 mole of magnesium nitrate has 6 moles of oxygen atoms. Then 0.004446 moles magnesium nitrate will have :

6\times 0.004446 mol=0.026676 mol\approx 0.0267

There are 0.0267 moles of oxygen in 0.658 grams of magnesium nitrate.

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4 years ago
What is a key property of crystals?
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