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Dahasolnce [82]
3 years ago
9

Which sample contains a total of 3.0 x 10^23 molecules?

Chemistry
1 answer:
belka [17]3 years ago
3 0
Given that 1 mole contains 6.02x10^23 molecules, 3.0x10^23 is just around half a mole. Then we check the number of moles for each choice:

A. This is approximately half a mole, since the molar mass of Br2 is 159.8 g/mol.
B. He has a molar mass around 4 g/mol, so this is 1 mole.
C. H2 has a molar mass of 2.02 g/mol, so this is 2 moles.
D. Li has a molar mass of around 6.97 g/mol, so this is around 2 moles.

Therefore the only choice that fits is A. 80 g of Br2.
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Answer: The energy of the 4-s subshell is lower than the energy of 3-d subshell.

Explanation:

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Energy of the sublevel = (n + l)

where : n = Principal quantum number

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Energy of 4-s subshell= (4+0) = 4

Energy of 3-d subshell=(3+2) = 5

Energy of 4-s subshell is lower than the energy of 3-d subshell, that is why 4s orbital is filled before the 3-d subshell.

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