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2 years ago

Number 7 plz tysm guys

Chemistry

2 answers:

MAXImum [283]2 years ago

8 0

The answer to your question is C

morpeh [17]2 years ago

6 0

It is letter C: Continental crust is thicker than oceanic crust.

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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

What became of alchemy after the 1700s

Dvinal [7]

Chemistry developed from alchemy after the 1700s. It was the Alchemist <span>observations and accidental discoveries that brought around modern chemistry.</span>

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3 years ago

Does protons ,electrons, and neutrons have anything to do with lighting?

antoniya [11.8K]

Answer:

Yes

Explanation:

hope this helps!

Do you want me to explain?

4 0

3 years ago

Write a list of gear that you would need to climb mount everast:

CaHeK987 [17]

Answer: You will need mountaineering equipment such as ice axes and crampons, clothing such as gloves and headwear, and supplies such as food, a stove to thaw water and the food, and first aid materials.

Explanation: Please mark as brainliest lol!

8 0

2 years ago

Read 2 more answers

Fill in the coefficients that was will balance the following reaction SnSO4 + KBr SnBr2 K2SO4

Juliette [100K]

The coefficients are 1 : 2 : 1 : 1

<u>Explanation:</u>

To be a balanced equation, the chemical equation should have has equal number of atoms on both reactant and product side.

Given chemical equation:

$a_{0} {SnSO}_{4}+a_{1} K B r \rightarrow a_{2} {SnBr}_{2}+a_{3} K_{2} S O_{4}$