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Citrus2011 [14]
3 years ago
8

Which statement describes a property of covalent compounds?

Chemistry
2 answers:
Maksim231197 [3]3 years ago
5 0
They have a low boiling point because of weak intermolecular forces.
DIA [1.3K]3 years ago
4 0
B) They have a low boiling point because of the weak <span>intermolecular </span>forces.

Hope this helped!
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On the periodic table, calcium is in group 2. What is true about calcium?
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Explanation:

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An atom of sodium can transfer its one valence electron to an atom of
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2 years ago
1. A sample of polystyrene is found to have a number-average molar mass of 89,440 g mol−1 . Neglecting contributions from end gr
Snowcat [4.5K]

Answer:

The weight-average molar mass of polystyrene is 134,160 g/mol.

Explanation:

Molar mass of the monomer styrene , C_8H_8, M=104 g/mol

Given , number average molar mass of the polymer , M'= 89,440 g/mol

Degree of polymerization = n

n=\frac{M'}{M}=\frac{89,440 g/mol}{104 g/mol}=860

The weight-average molar mass = M_{avg}=?

Molar mass dispersity is ratio of weight-average molar mass to the number average molar mass of the polymer.

\text{Molar mass dispersity}=\frac{M_{avg}}{M'}

1.5=\frac{M_{avg}}{89,440 g/mol}

M_{avg}=89,440 g/mol\times 1.5 = 134,160 g/mol

The weight-average molar mass of polystyrene is 134,160 g/mol.

8 0
2 years ago
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