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3 years ago

Which statement describes the phase change that occurs when dry ice is placed in an open container at room temperature?

Chemistry

2 answers:

zloy xaker [14]3 years ago

7 0

Answer:

Dry ice undergoes sublimation, an endothermic change at room temperature.

emmasim [6.3K]3 years ago

6 0

Answer:

Dry ice undergoes sublimation, an endothermic change, at room temperature.

yuh:

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How many moles of Au2S3 is required to form 56 grams of H2S at STP?

Law Incorporation [45]

Answer:

0.55 mol Au₂S₃

Explanation:

Normally, we would need a balanced equation with masses, moles, and molar masses, but we can get by with a partial equation, if the S atoms are balanced.

1. Gather all the information in one place:

M_r: 34.08

Au₂S₃ + … ⟶ 3H₂S + …

m/g: 56

2. Calculate the moles of H₂S

Moles of H₂S = 56 g H₂S × (34.08 g H₂S/1 mol H₂S)

= 1.64 mol H₂S

3. Calculate the moles of Au₂S₃

The molar ratio is 1 mol Au₂S₃/3 mol H₂S.

Moles of Au₂S₃ = 1.64 mol H₂S × (1 mol Au₂S₃/3 mol H₂S)

= 0.55 mol Au₂S₃

7 0

3 years ago

Which of the following statements is true?

zalisa [80]

It's A, t<span>The figure is a molecule and an element.</span>

6 0

2 years ago

Read 2 more answers

Whats the name?!?!?!??!?!?!?!?!?!?!!?!?!?!??!?!?!?!

SIZIF [17.4K]

Hydrogen i suppose is the right one

7 0

2 years ago

3: Consider molecules of hydrogen (tiny ones) and oxygen (bigger ones) in a gas mixture. If they have the same average kinetic e

mezya [45]

Answer: Hydrogen molecules will have greatest average speed.

Explanation:

The formula for average speed is :

$\mu_{av}={\sqrt{\frac{8RT}{\pi\times M}}}$

R = gas constant

T = temperature

M = Molecular Mass

Now putting all the values:

$\frac{\nu_{H_2}}{\nu_{O_2}}=\sqrt{\frac{8RT}{\pi\times M_{H_2}}}/{\sqrt{\frac{8RT}{\pi\times M_{O_2}}}$

$\frac{\nu_{H_2}}{\nu_{O_2}}=\sqrt{\frac{16}{2}}$

$\frac{\nu_{av}_{H_2}}{\nu_{av}_{O_2}}=8$

Thus average speed of hydrogen is 8 times the average speed of oxygen. Thus hydrogen molecules will have greatest average speed

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2 years ago

Some male coworkers of Suzanne are bullying her because she is a woman which type of work hazard is this

Mandarinka [93]

Answer: D
Psychological Hazard

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2 years ago