3 years ago

Which characteristic is common of cnidarians

Chemistry

1 answer:

just olya [345]3 years ago

6 0

Answer:

it's -C......................

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The amount of matter in an object is called

marta [7]

Answer: Matter

Explanation:

Matter is anything that has volume and/or mass.

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3 years ago

Pls give help me out>!

iris [78.8K]

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3 because it the element that combined the form

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2 years ago

Sum of all forces acting on object is it a forces, unbalanced forces , balanced forces, net forces

malfutka [58]

Answer: The answer is Net Forces.

Net force is the vector sum of forces acting on a particle or body.

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4 years ago

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When 10g of calcium carbonate is heated,4.4g of carbon dioxide escape out. The amount of residue left is:

Maslowich

The dissociation of calcium carbonate, CaCO3, to simpler compounds can be expressed as,
CaCO3 --> CaO + CO2
The precipitate is CaO and its amount is calculated through the difference which will give us the answer of 5.6 g.

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3 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.

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3 years ago