The molar mass for H is 1 and for He is 4. What is the ratio of the molar mass of He to that of H2?

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Question: The molar mass for H is 1 and for He is 4. What is the ratio of the molar mass of He to that of H2?

Option a: 2
Option b: 4
Option c: 1/2
Option d: 1/4

Step-by-step analysis:
- First, determine the molar mass of H2. Since each H atom has a molar mass of 1, H2 (two H atoms) has a molar mass of 1 + 1 = 2. This is a fundamental chemical fact: diatomic hydrogen has molar mass 2 g/mol.
- Next, note the molar mass of He is given as 4.
- Now form the ratio requested: molar mass of He to molar mass of H2 is 4 (for He) divided by 2 (for H2), which equals 4/2 = 2.

Option-by-option evaluation:
- Option a (2): Computing 4 divided by 2 gives 2, which matches the calculated ratio. This option aligns with the basic molar masses provided and the definition of a ratio.
- Option b (4): This would imply a ratio of 4, which would require either He to be 8 g/mol or H2 to be 1 g/mol. Neither is true given the data (He = 4, H2 = 2).
- Option c (1/2): This would occur if He were 1 and H2 were 2, or if He were 2 and H2 were 4. Both scenarios contradict the given molar masses (He = 4, H2 = 2).
- Option d (1/4): This would require He to be 1 and H2 to be 4, or He to be 2 and H2 to be 8. Again, these do not match the provided values.

Summary of reasoning:
- The key steps are identifying H2’s molar mass as 2 and He’s as 4, then forming the ratio 4/2 = 2. The other options propose ratios that would demand inconsistent molar masses or misinterpret the diatomic hydrogen’s mass.

UCIC 202503 PHYS101 Quiz 6

The molar mass for H is 1 and for He is 4. What is the ratio of the molar mass of He to that of H2?

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