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Usimov [2.4K]
3 years ago
11

Help in chem please!!!!!!

Chemistry
1 answer:
IgorLugansk [536]3 years ago
3 0

This is a one-step unit analysis problem.  Since we are staying in moles, grams of our compound, and thus molar mass, is not needed.

1 mole is equal to 6.022x10²³ particles as given, so:

1.5x10^{24} particles FeO_{2} (\frac{1mol}{6.022x10^{23}particles } )=2.49 molFeO_{2}

<h3>Answer:</h3>

2.49 mol

Let me know if you have any questions.

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Why is CCl4 a nonpolar molecule, but PCl3 is a polar molecule?
Anna11 [10]
If you follow the octet rule, you know that an element must have 8 outside (or valence) electrons to be energetically favorable.

In CCl4, the carbon molecule forms four bonds; one for each chlorine atom. Each bond contains 2 electrons, so it is satisfied.

In PCl3, Phosphorous forms only 3 bonds with chlorine, which means in order to have 8 valence electrons, it also has a lone pair of electrons, not bonded with chlorine.

Now, in CCl4, picture the shape of the molecule like a plus sign, with the carbon in the middle and the chlorine at the four ends. It is symmetrical, and therefore is nonpolar.

In PCl3, the lone pair electrons <em>push</em>, so to speak, the 3 chlorine atoms away, making a T-shaped molecule.  Since the chlorine is more electronegative than carbon, the molecule is unbalenced, making it polar.
6 0
3 years ago
Calculate the amount of heat required to raise the temperature of an 64 g sample of water from 32 ∘C to 69 ∘C.
Serjik [45]

Answer:

9945.6 J

Explanation:

Amount of heat = Mass * Heat Capacity * Temperature Change

Heat capacity of Water = 4.2 J/gC

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Amount of heat = 9945.6 J

4 0
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7 0
3 years ago
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vova2212 [387]

Answer:

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Explanation:

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3 0
4 years ago
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stiks02 [169]

Answer:

Below.

Explanation:

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