Ask question

Ask question

All categories

Sergio039 [100]

3 years ago

8

Porque a propriedade da agua de dissolver outras substancias e importante para a vida ?

1 answer:

makkiz [27]3 years ago

8 0

<span>Olá amiga... creio que para obter uma melhor resposta para sua questão... seria melhor postar no lugar certo... como em Ciências ou biologia.. boa sorte!!! </span>

You might be interested in

What is the net ionic charge of an oxygen ion?<br> a+3<br> b-3<br> c-2<br> d-1

neonofarm [45]

C. -2
For future reference, the periodic table should tell you.

7 0

3 years ago

Read 2 more answers

During oxidation, which of the following is true? A. Electrons are gained, so the oxidation number increases. B. Electrons are g

EastWind [94]

Oxidation is when the overall charge (or oxidation number) increases. The only way to increase an oxidation number is to lose an electron, thereby making the negative charges less. The correct answer is C.

6 0

3 years ago

Read 2 more answers

How many molecules in H2O?

Mrac [35]

There are a lot of molecules in H2O.<span />

3 0

3 years ago

Dan states that a certain layer of the sun is like the brightest street lamp in a city. Which layer of the sun is Dan referring

sdas [7]

Answer:

He is referring to the chromosphere

Explanation:

8 0

4 years ago

Read 2 more answers

If 200 g of benzoyl peroxide are used with 38 Kg of PTFE monomer, calculate the expected molecular weight of the polymer if (i)

den301095 [7]

Explanation:

The molecular weight of benzoyl peroxide is 242.23 g/mol.

Therefore, number of moles present in 200 g of benzoyl peroxide are as follows.

No. of moles = $\frac{mass}{\text{molar mass}}$

= $\frac{200 g}{242.23 g/mol}$

= 0.825 mol

Molecular weight of PTFE is 100 g/mol.Hence, calculate the number of moles of PTFE in 38 kg as follows.

As 1 kg = 1000 g. So, 38 kg = 38000 g.

No. of moles = $\frac{mass}{\text{molar mass}}$

= $\frac{38000 g}{100 g/mol}$

= 380 mol

As it is given that the initiator is 15% active. So, actual number of moles of benzoyl peroxide are as follows.

$0.15 \times 0.826$

= 0.124 mol

For combination, 1 mol of benzoyl peroxide produces 1 chain. Therefore, degree of polymerization will be calculated as follows.

DP = $\frac{380 mol}{0.124 mol}$

= 3065.33 mol

Average molecular weight of monomer is as follows.

$\frac{0.124}{0.124 + 380} \times MW_{benzoyl} + \frac{380}{0.124 + 380} \times MW_{PTFE}$

= 100.05 g/mol

Therefore, calculate the expected molecular weight of polymer as follows.

$3065.33 \times 100.05 g/mol$

= 306675.23 g/mol

Hence, for disproportion 1 mole benzoyl peroxide produces 2 chains.

DP = $\frac{2 \times 380}{0.124}$

= 6129.03

Therefore, calculate the expected polymer weight as follows.

$6129.03 \times 100.05$

= 613209.68 g/mol

Thus, we can conclude that the the expected polymer weight is 613209.68 g/mol.

6 0

4 years ago