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3 years ago

While a balloon is being filled, if the temperature of the air in the balloon increases, what happens to it’s volume?

1 answer:

6 0

When heating up, the balloon slowly rises and flies up in the air again. Explanation: The volume of the balloon decreases by the low temperature, because the gas inside is cooled down. When heated up, the pressure in the balloon rises, the balloon expands, and will reach to its original shape.

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How many molecules of CF₂Cl₂ are in 45.7 grams of CF₂Cl₂? (Show work)

posledela

Answer:

The answer to your question is: 2.20 x 10 ²³ molecules

Explanation:

Data

mass = 45.7 g

molecules of CF₂Cl₂ = ?

Process

1.- Calculate the mass number of CF₂Cl₂

C = 12 F =2 x 19 Cl = 2 x 35.5

total = 12 + 38 + 71

total = 121 g

2.- Use the Avogradro's number to solve the problem

121 g ------------------- 6.023 x 10²³ molecules of CF₂Cl₂

45.7 g --------------- x

x = (45.7 x 6.023 x 10²³) / 121

x = 2.75 x 10²⁵ / 121

x = 2.20 x 10 ²³ molecules

4 0

3 years ago

How many grams of zinc would be required to produce 9.65g of zinc hydroxide

Effectus [21]

The question is incomplete, here is the complete question:

How many grams of zinc would be required to produce 9.65g of zinc hydroxide

Zn+2MnO₂+H₂O→Zn(OH)₂+Mn₂O₃

<u>Answer:</u> The mass of zinc required is 6.35 grams

<u>Explanation:</u>

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$ .....(1)

Given mass of zinc hydroxide = 9.65 g

Molar mass of zinc hydroxide = 99.4 g/mol

Putting values in equation 1, we get:

$\text{Moles of zinc hydroxide}=\frac{9.65g}{99.4g/mol}=0.0971mol$

The given chemical equation follows:

$Zn+2MnO_2+H_2O\rightarrow Zn(OH)_2+Mn_2O_3$

By Stoichiometry of the reaction:

1 mole of zinc hydroxide is produced from 1 mole of zinc

So, 0.0971 moles of zinc hydroxide will be produced from = $\frac{1}{1}\times 0.0971=0.0971mol$ of zinc

Now, calculating the mass of zinc from equation 1, we get:

Molar mass of zinc = 65.4 g/mol

Moles of zinc = 0.0971 moles

Putting values in equation 1, we get:

$0.0971mol=\frac{\text{Mass of zinc}}{65.4g/mol}\\\\\text{Mass of zinc}=(0.0971mol\times 65.4g/mol)=6.35g$

Hence, the mass of zinc required is 6.35 grams

6 0

3 years ago

Name the following cycloalkane:

KonstantinChe [14]

B is the correct answer

8 0

2 years ago

Where might you find a temperature of 2 kelvin?

lyudmila [28]

100°C is 273 kelvins.

1°C is 2.73 kelvins.

I guess the closest would be north pole

7 0

3 years ago

Explain why a potassium atom would not bond with a calcium atom?

docker41 [41]

Answer:

Calcium atoms have smaller radii than potassium atoms since calcium atoms have a greater nuclear charge. Each calcium atom will be closer to the delocalized electrons. Thus, the bonds in calcium will be stronger than that in potassium.

Explanation:

6 0

2 years ago