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Marta_Voda [28]
3 years ago
7

Which of the changes of state requires the removal of energy?

Chemistry
2 answers:
andrew11 [14]3 years ago
8 0

Answer:

condensation and freezing, hope this helps

Explanation:

anyanavicka [17]3 years ago
4 0

Answer: condensation and melting

Explanation: it requires the most energy

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aleksandr82 [10.1K]
97 g of c3h8 is equal to 2.2 moles 
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4 0
3 years ago
What is the molecular formula for C5H7 if its molar mass is 536 g/mol?
hodyreva [135]

Answer:

(C5H7)8

Explanation:

It's empirical formula is given as; C5H7

Molar mass of carbon(C) = 12 g/mol

Molar mass of hydrogen(H) = 1 g/mol

We are told that it's molar mass is 536 g/mol.

To find the molecular formula;

Molecular formula = n × empirical formula

Thus;

n = 536/((12 × 5) + (1 × 7))

n = 8

Thus;

Molecular formula = (C5H7)8

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A substance joined by this type of bond has a low melting point
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Covalent compounds have bonds where electrons are shared between atoms. Due to the sharing of electrons, they exhibit characteristic physical properties that include lower melting points and electrical conductivity compared to ionic compounds.
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