CHEMISTRY MIDDLE SCHOOL

Hydrogen is a liquid below what temperature?a.
100 degrees C
c.
-183 degrees C
b.
-253 degrees C
d.
0 degrees C

Answers

Answer 1
Answer:

Answer:

  • The hydrogen exist as a liquid at -253 degree C.

Explanation:

  • Hydrogen is found as a molecular form H2. In order to become liquid , it must be cooled below its critical temperature. It become liquid at -253 degree C or 423.17  degree F or 20.8 K.
  • So hydrogen become liquid at -253 degree Celsius.
Answer 2
Answer: Hydrogen is a liquid below -253 degrees C

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Convert 43.0 grams of SiH4 to moles

Answers

The number of moles in the 4.30 g of SiH₄ is  1.338 moles.

What are moles?

The mole is a SI unit of measurement that is used to calculate the quantity of any substance.

To calculate the moles

The molar mass of SiH₄ is 32.12 g

The mass of SiH₄ is 43.0 g

\rm Number\;of \;moles= (mass)/(molar\;mass)\n\n\rm Number\;of \;moles= (43.0)/(32.12) = 1.338\; mol

Thus, the number of moles in the 4.30 g of SiH₄ is 1.338 moles.

Learn more about moles

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43.0 grams of SiH4 converts to 1.338 moles.

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Answers

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Answers

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