Hydrogen in Molecular Form,H₂,is Thought to Be Very Abundant in Gas

question 94

Multiple Choice

Hydrogen in molecular form,H₂,is thought to be very abundant in gas clouds in space,but these molecules emit radiation relatively inefficiently since they are symmetrical.Which other molecule occurs in close association with H₂ and is used as a probe for molecular clouds?

• A) carbon monoxide (CO)
• B) methane (CH₄)
• C) water vapor (H₂O)
• D) carbon dioxide (CO₂)

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