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Lesechka [4]
3 years ago
8

Sobre ações relacionadas ao aquecimento global, assinale somente as alternativas corretas:

Chemistry
1 answer:
Law Incorporation [45]3 years ago
6 0

Answer:

123456788012346778901234567890

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Select the correct answer.
Ymorist [56]

Answer:

E

Explanation:

The question talks of a PHYSICAL model of the sun. An equation, chart, computer program and paragraph are most definitely not physical models.

8 0
3 years ago
Hydrogen Peroxide, H2O2, in the presence of a catalyst decomposes into water and oxygen gas. How many L of O2 at STP are produce
Korolek [52]

Answer:

There is 11.2 L of O2 produced

Explanation:

<u>Step 1:</u> Data given

Molar mass of H2O2 = 34.01 g/mol

Molar mass of O2 = 32 g/mol

Mass of H2O2 = 34.0 grams

<u>Step 2:</u> The balanced reaction

2H2O2 → 2H2O + O2

<u>Step 3</u>: Calculate number of moles H2O2

Moles H2O2 = Mass H2O2 / Molar mass H2O2

Moles H2O2 = 34 grams / 34.01 g/mol

Moles H2O2 = 1 mol

<u>Step 4: </u>Calculate the number of moles at the equilibrium

Initial number of moles H2O2 = 1 mol

Initial number of mol H2O and O2 = 0 mol

Since the mol ratio H2O2 H2O O2 is 2:2:1

There will react x mol of H2O2; X mol of H2O and 0.5 x mol of O2

At the equilibrium, H2O2 has (1-x) mol. Since it's decomposed into H2O and O2, we know x =1 mol

At the equilibrium, there is 1 mol H2O and 0.5 mol O2

Under STP, 1 mol of gas has a volume of 22.4 L

This means 0.5 moles of O2 has a volume of 22.4*0.5 = 11.2 L

There is 11.2 L of O2 produced

4 0
3 years ago
(52.6 cm)(1.214cm) what is the product expressed to the correct number of significant figures?
pashok25 [27]
The product is 63.8564
The correct number of S.F is 64.0000
3 0
2 years ago
How many grams are in 3.45 moles NaCl
seropon [69]
201.62755650000003 grams
3 0
2 years ago
Read 2 more answers
What does a decrease in temperature indicate about the molecules in a sample of liquid water? (3 points)
Tcecarenko [31]

Answer: Decreased kinetic energy of the molecules

<em> The first option that is given in the question is the correct option. </em>

Explanation:

The molecules of a substance act differently at different temperatures but we know that its energy is dependent on the temperature at which it is present. The normal tendency of molecules is to vibrate on move around but, when it absorbs a certain amount of heat it gains more energy and tends to move around faster.

And just the other way round happens when heat is lost so we can say with a decrease in temperature the activity of molecules will also decrease and hence the kinetic energy will be decreased.

6 0
3 years ago
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