Helium Effuses Through a Small Opening at a Rate of 1×10^-9

question 4

Multiple Choice

Helium effuses through a small opening at a rate of 1×10^-9 mol s^-1. An unknown gas at the same temperature and pressure is found to effuse through the same opening at a rate of 3.78×10^-10 mol s^-1. What is the molecular mass of the unknown gas?

• A) 4 g mol^-1
• B) 14 g mol^-1
• C) 18 g mol^-1
• D) 28 g mol^-1
• E) 40 g mol^-1

---

Definitions:

Europeans

Residents or natives of Europe, a continent located entirely in the Northern Hemisphere and mostly in the Eastern Hemisphere.

Women's Rights

The freedoms and rights claimed for women and girls worldwide, and formed the basis for the women's rights movement in the 19th century and feminist movement during the 20th century.

Coverture

A legal doctrine whereby, upon marriage, a woman's legal rights and obligations were subsumed by those of her husband, limiting her legal autonomy.

Contracts

Legally-binding agreements between two or more parties that outline obligations each party must fulfill.